How to Prepare for a 90-Day Blackout
Treat a 90-day blackout as a planning ceiling, not a forecast. Start with official U.S. baselines - several days of supplies (Ready.gov) and a two-week home supply (American Red Cross) - then add ways to treat more water, keep food safe, avoid carbon monoxide, handle sanitation, and decide when the house is no longer safe to stay in.
People search for a grid down survival guide when they want more than a flashlight in a drawer. Official U.S. pages do not tell every household to store 90 days of everything. Ready.gov starts with several days of food, water, and supplies. The American Red Cross recommends a three-day kit if you may have to leave and a two-week supply for home.
What 90 days should mean in a household plan
Ninety days is an optional deeper reserve after official first layers are real, especially if someone depends on electricity for medical equipment or you live with extreme heat or cold.
No calm plan should pretend that a 90-day regional outage is the default week. Ready.gov’s kit and power-outage pages start with several days of supplies. The American Red Cross recommends a three-day kit if you may have to evacuate and a two-week supply for your home. 90 Days Without Power by Robert Smythe treats those baselines as the first, most important steps.
Documented long disruptions have happened. The book points at official reviews of events such as the February 2021 Texas outages, Hurricane Maria in Puerto Rico, the 2003 Northeast blackout, and the 1998 Québec ice storm without inventing customer counts. Most households will only ever need the first 72 hours and the two-week layer. Building further is a choice, not a prophecy.
Build in stages so you can stop when the plan fits
Work in this order: the first 72 hours, two weeks, 30 days, then an optional 90-day cushion. Each stage reuses the last instead of starting a new fantasy inventory.
72 hours. Water at one gallon per person per day, no-cook food, a flashlight for each person, a way to hear official alerts (a NOAA weather radio does not depend on home Wi-Fi), medicines you actually take, and battery carbon monoxide and smoke alarms.
Two weeks. This matches the Red Cross home-supply idea and CDC language that says to try to store a two-week supply of water if possible. Add sanitation supplies, a manual can opener, and a cooking method you will only use outdoors.
30 days. Keep the two-week water store and add a reliable way to treat more water. Rotate a deeper pantry of foods you already eat.
90 days. Few homes can store 90 days of water by volume. The plan shifts toward treatment, rotation, medicine logistics, sanitation, and a written trigger for leaving if heat, cold, or medical needs make the house unsafe.
For four people, two weeks of water at the Ready.gov baseline is 56 gallons. Ninety days is 360 gallons - roughly 3,000 pounds - before extra heat-related drinking. That is why a long plan is a water-treatment plan, not only a warehouse plan. Use the water storage calculator to size your household.
The problems that actually hurt people
In real long outages the documented household dangers are unsafe water, spoiled food, missed medicine, extreme heat or cold, and carbon monoxide from indoor generators or grills.
CDC and CPSC both say to keep generators outdoors, more than 20 feet from windows, doors, and vents, and never in a garage even with the door open. Ready.gov says never to use a gas stovetop or oven to heat a home. See generator carbon monoxide safety.
USDA / FoodSafety.gov: a closed refrigerator keeps food safe about 4 hours; a full freezer about 48 hours; a half-full freezer about 24 hours. When in doubt, throw it out; never taste food to decide. Details are in food safety during a power outage.
Heat changes the plan. CDC notes that indoor fans alone are not a reliable cooling method around 90°F and above. In desert cities, a named cooling-center backup belongs next to your water math. In cold climates, one sealed, insulated room and safe heat matter more than owning every gadget on a packing list.
Medicines, devices, and the decision to leave
Write down every critical medicine, how many days you have on hand, and what the label says about refrigeration. If a powered device or a cold-chain drug cannot be maintained, leaving may be the plan.
The Red Cross includes a seven-day supply of medications in a basic kit. For anything longer, talk to your clinician or pharmacist before storm season. CDC says that if power is out for a day or more, throw away medication that should be refrigerated unless the label says otherwise, and consult a clinician for a replacement.
FDA publishes emergency insulin storage information that is product-specific. Do not improvise from a general paragraph if your label says otherwise. A go-bag and two written routes matter only if you also have a real destination.
Sanitation, neighbors, and morale
After a few days without flowing water, a lined bucket, a lid, soap, and a dedicated handwashing jug prevent a second emergency.
Keep waste away from stored drinking water. Ready.gov lists moist towelettes, garbage bags, and plastic ties in a basic kit for this reason.
A small, named group of nearby households who check on each other is worth more than a costume patrol. Share information, not your entire pantry list. Mental health is part of preparedness: rest, a daily routine, and the Disaster Distress Helpline at 1-800-985-5990.
90 Days Without Power by Robert Smythe is built as the full guide to survival during a long blackout. Gear QR codes in the print edition open the Top 50 gear pages on this site. Official pages win if a presenter and CDC, EPA, or Ready.gov disagree. See what’s inside the book.
What to do in the first hour, the first night, and the first week
In the first hour, check on people, shut the fridge and freezer, find light that is not your last phone charge, and hear an official alert. Overnight, keep one room livable and do not improvise heat or power in a closed space. In the first week, stretch water and food with official times and decide whether the house is still safe.
A long-outage plan fails when it is only a shopping list. Walk the house once while the lights still work and note the breaker panel, the water shutoff, the places you will store jugs, and the room you would use if the building became very hot or very cold. Write those notes on paper. Ready.gov’s family emergency plan pages have recommended written contacts and meeting places for years because phones die and group chats vanish.
In the first hour of an actual outage, resist opening the refrigerator to “see what we have.” USDA and FoodSafety.gov give a closed refrigerator about 4 hours of safe time for perishable food. Every open door spends some of that time. Put a note on the door if you have children who will check out of habit. If you have appliance thermometers already inside, you will know later whether food stayed at or below 40°F.
The first night is when unsafe heat ideas appear. Ready.gov says never to use a gas stovetop or oven to heat a home. CDC and CPSC say never to run a generator, pressure washer, or gasoline engine in a home, basement, or garage, or less than 20 feet from windows, doors, and vents. A battery carbon monoxide alarm near sleeping areas belongs in the 72-hour layer, not in a later luxury list.
By day three you should know whether this is a short interruption or something longer. If the outage is regional, cell networks may be congested. A NOAA weather radio and Wireless Emergency Alerts on a charged phone are the official-alert paths that do not depend on your home router. Ready.gov/alerts explains the public warning systems. State editions of 90 Days Without Power list each pilot state’s information network.
By the first week, sanitation and morale start to matter as much as calories. Ready.gov includes moist towelettes, garbage bags, and plastic ties in a basic kit for a reason. A lined bucket with a lid, a dedicated handwashing jug, and a place for waste away from stored drinking water prevent a second emergency. Check on neighbors without advertising your entire pantry. The Disaster Distress Helpline is 1-800-985-5990, and 988 is the Suicide and Crisis Lifeline.
A 90-day cushion is optional and uneven. Few homes can store 360 gallons of water for four people. The book’s later chapters therefore emphasize treatment methods, rotation, medicine logistics, and a written leave trigger if heat, cold, or a medical device makes the house unsafe. That is planning, not a prediction that the grid will be down for a season.
How this page connects to the rest of the site and the book
Use the free guides for the questions people type into a search box, then use the book for the diagrams, worksheets, and the full chapter sequence.
The water calculator at how much water to store for 90 days uses Ready.gov’s one-gallon baseline and the note that needs can double in heat. Making water safe walks through boiling, EPA bleach doses, filters, chlorine dioxide, SODIS, and distillation, and says what each method cannot do.
Food times live on food safety during a power outage. Generator placement and the devices that must never become heaters are on generator carbon monoxide safety. Heat and cold have their own pages because an Arizona summer outage and a Minnesota winter outage are different emergencies that share the same water and CO rules.
QR codes in the printed book open the Top 50 gear pages on this site. The book itself does not contain Amazon associate tags. If you want a state overlay, start with the state edition index. Official pages win if any presenter, including this one, disagrees with Ready.gov, CDC, EPA, USDA, or your local emergency order.
Questions people ask
Is a 90-day blackout something official agencies expect?
No. Ready.gov starts with several days of supplies, and the American Red Cross recommends a two-week home supply. Ninety days is an optional deeper cushion after those layers are real.
What should I buy first?
Water at one gallon per person per day, no-cook food, flashlights, a NOAA radio, medicines you take, and battery carbon monoxide and smoke alarms.