Building emergency supplies means packing for at least 72 hours of self-sufficiency with water, food, light, first aid, and sanitation.
The goal of emergency preparedness is simple: be able to shelter in place or evacuate for three days without outside help. Ready.gov recommends storing supplies in airtight plastic bags inside one or two easy-to-carry containers, kept in a designated spot at home. For most households, that means one kit that stays put and one portable grab-and-go bag for evacuation.
Start With Water, Food, and Clean Air
Before comfort items, cover the three non-negotiables. Water tops the list: plan on one gallon per person per day for drinking and basic hygiene, for several days. That means a family of four needs at least 12 gallons for a 72-hour window.
Food comes next. Pack a three-day supply of nonperishable items per person — canned goods, granola bars, dried fruit, peanut butter. A manual can opener must sit in the kit alongside the cans, or that food is useless. For clean air, include dust masks, plastic sheeting, scissors, and duct tape so you can seal a room if needed.
These three categories alone cover the survival basics. Everything else supports them.
The Core Supplies Every Household Kit Needs
Beyond water, food, and air, the essential list covers light, communication, first aid, sanitation, and tools. The table below compresses the full minimum contents so you can check your kit against it.
| Category | Items to Pack |
|---|---|
| Light | Flashlight with extra batteries; never candles or open flames |
| Communication | Battery-powered or hand-crank radio; NOAA Weather Radio with tone alert is the recommended pick |
| First aid | Complete first aid kit plus any prescription medications |
| Signaling | Whistle to call for help if trapped |
| Sanitation | Moist towelettes, garbage bags, and plastic ties |
| Tools | Wrench or pliers to shut off utilities; manual can opener |
| Documents | Local maps, cash in small bills, copies of ID and insurance papers |
| Comfort | Sleeping bags or blankets, change of clothes, sturdy shoes |
| Phone | Cell phone with chargers and a backup battery or power bank |
If you need to evacuate, the same list shrinks into a duffel bag or plastic bin. Keep the portable version near the door or in the car so it’s reachable when minutes matter.
Tailoring Your Kit to Your Household
A one-size-fits-all checklist misses the people who depend on you. Ready.gov explicitly says to tailor kits to household needs, and that includes pets and medications.
Infants need formula, diapers, and wipes. Older adults may need eyeglasses, hearing aid batteries, or a two-week supply of prescriptions if evacuation stretches longer than expected. Pets need their own food and water — pack a three-day portion for each animal. Anyone on a medical device should plan for backup power and extra supplies.
Region matters too. Hurricane zones need tarps and rope; wildfire areas need N95 masks and goggles; winter-storm regions need extra blankets and warm layers. Your local emergency management office publishes the specific hazards for your area.
Maintaining and Using Your Kit
Assembling the kit is step one; keeping it current is the real work. Review everything once a year and replace anything expired — food, water, medications, and batteries all degrade. Rotate stored water every six to twelve months, and swap canned goods before their “best by” dates pass.
Store everything in airtight plastic bags inside the container. This keeps moisture out and makes the kit easier to grab as a unit. Keep the stay-put kit in a designated closet or cabinet, and the portable bag near an exit.
Practice the plan. Everyone in the household should know where the kits live, where the meeting point is, and how to shut off the gas and water. Emergency contact information goes in the kit, not just on your phone — phones die during disasters.
One safety warning that matters: never use charcoal grills or camping stoves indoors for heat or cooking. After a quake or storm, check for gas leaks before lighting anything.
For a tested list of grab-and-go gear, see our roundup of the best emergency supplies for home and evacuation.
California’s public health guidance sums it up plainly: be prepared to make it on your own for at least three days, maybe longer. That 72-hour window is the national standard because it’s the realistic gap before help arrives. Build the kit now, refresh it yearly, and you’ve removed the hardest part of any emergency — the decision about what to grab when the clock is running.
FAQs
How much water should one person store?
Plan on one gallon per person per day for drinking and basic hygiene. For a 72-hour kit, that’s three gallons per person minimum. A family of four needs twelve gallons total, plus extra if anyone is pregnant, nursing, or living in a hot climate where hydration needs rise.
What food lasts longest in an emergency kit?
Canned goods with high protein and fat content store best, alongside dried fruit, nuts, granola bars, and shelf-stable peanut butter. Rotate items yearly and check expiration dates when you refresh the kit. Remember the manual can opener — without it, canned food becomes a paperweight.
Should I keep emergency supplies in my car?
Yes, a separate compact kit for the vehicle makes sense. Include a flashlight, jumper cables, a basic first aid kit, a blanket, bottled water, and nonperishable snacks. Ready Illinois advises kits for the house, vehicle, and workplace so you’re covered no matter where you are when disaster strikes.
References & Sources
- Ready.gov. “Build A Kit.” Defines the 72-hour standard and full minimum contents list.
- California Department of Public Health. “Prepare an Emergency Supply Kit.” Confirms the three-day minimum and household-specific tailoring.
- Government of Canada. “Get an Emergency Kit.” Corroborates water, food, and tool requirements for household preparedness.