How to Build a 72-Hour Emergency Kit: A Step-by-Step Guide

A 72-hour emergency kit is the single most practical preparedness step any household can take. FEMA recommends three days of supplies because that is the realistic window before organized relief systems reach most disaster-affected households. Assembling one does not require a survivalist mindset or a dedicated room — it requires a clear list, a few hours, and the follow-through to actually do it.

This guide walks through each component of a complete 72-hour kit, explains the reasoning behind specific quantities, and covers special considerations for households with unique needs. Follow these steps in order, and you will have a functional kit assembled within a week.

Step 1: Water — The Non-Negotiable First Priority

Water is the most critical element of any emergency kit, and the most commonly under-stocked. The widely cited standard — one gallon per person per day — accounts for drinking and basic sanitation. That means a family of four requires a minimum of 12 gallons for 72 hours. Add one additional gallon per pet per day.

Store water in food-grade containers with tight-sealing lids. Commercially sealed water jugs are the most convenient option. If you fill your own containers from tap water, add 8 drops of unscented liquid chlorine bleach per gallon and replace every six months. Keep containers away from direct sunlight, petroleum products, and pesticides, which can permeate plastic.

Water purification tools serve as a backup, not a replacement for stored water. Include water purification tablets or a quality portable filter in your kit. The CDC's guidance on emergency water safety outlines purification methods by contaminant type.

Step 2: Food — Calories Without Complexity

Emergency nutrition is about sustaining energy and morale, not gourmet eating. Prioritize shelf-stable foods that require no refrigeration and minimal preparation. The goal is 2,000 calories per adult per day, adjusted for children and physical activity levels during an emergency.

Stock foods your household actually eats. Taste fatigue — the psychological exhaustion from eating unfamiliar emergency rations — is a real phenomenon that undermines morale during extended incidents. A mix of familiar pantry staples and purpose-built emergency food works well.

If your household includes infants, stock formula, baby food, and sufficient diapers for the kit period. Those managing chronic conditions like diabetes should consult their physician about food requirements during an emergency; the American Diabetes Association publishes specific guidance for managing diabetes during disasters.

Step 3: First Aid and Medications

A fully stocked first aid kit goes beyond adhesive bandages. Disaster scenarios frequently involve minor injuries — cuts from debris, burns, sprains from uneven terrain — that become serious if untreated in the days before professional medical care is accessible.

Your kit should include: sterile gauze pads and rolls, adhesive bandages in multiple sizes, antiseptic wipes and antibiotic ointment, medical tape, elastic bandages, tweezers, scissors, a digital thermometer, disposable gloves, a CPR face shield, and over-the-counter pain relievers, antihistamines, and antidiarrheal medication.

Prescription medications require advance planning. Maintain at least a 7-day supply of all essential medications in your kit, rotating stock before expiration. Keep a written list of every medication, dosage, and the prescribing physician's contact information for each household member. Many pharmacies will provide emergency supplies during declared disasters, but having your own supply eliminates dependence on that system.

The American Red Cross emergency supply list offers a detailed first aid checklist you can use alongside this guide.

Step 4: Documents and Communication

Important documents are among the most devastating losses in a disaster, and among the easiest to protect. Make copies of critical documents and store them in a waterproof, fireproof bag inside your kit. Scan everything and store digital copies in encrypted cloud storage accessible from any device.

Documents to include: government-issued IDs for every household member, Social Security cards, passports, insurance policies (health, auto, homeowners or renters, life), property deeds or lease agreements, bank account information, and a list of emergency contact numbers written on paper.

For households with children in school or family members who work at a distance, establish an out-of-state contact who can serve as a communication hub. It is often easier to reach someone outside an affected area than to contact people within it.

Step 5: Light, Warmth, and Shelter Tools

Power outages accompany most significant disasters. Prepare for darkness and temperature extremes with basic supplies.

Lighting: stock at least two flashlights per household with extra batteries, plus a headlamp for hands-free work. Glow sticks provide safe backup lighting around children. Avoid candles if possible — they create fire risk in already chaotic conditions.

Warmth: include one emergency mylar blanket per person minimum. These compact, reflective blankets retain up to 90% of body heat and weigh almost nothing. For colder climates, add a sleeping bag rated for winter temperatures, and store appropriate layers of clothing — including rain gear — for each household member.

Basic shelter tools: a tarp or emergency shelter, duct tape, and heavy-duty garbage bags have dozens of uses in disaster scenarios, from improvised shelter to waterproofing kit contents.

Step 6: Sanitation and Hygiene

Sanitation failures after disasters accelerate disease spread and compound suffering. Your kit should enable basic hygiene maintenance for three days without running water.

Essentials include: hand sanitizer (at least 60% alcohol), moist towelettes or baby wipes, toilet paper, soap, toothbrushes and toothpaste, feminine hygiene products, plastic bags (for waste disposal), and N95 masks (respiratory protection against dust, smoke, and airborne contaminants). A portable camp toilet or waste bags with chemical deodorizer rounds out sanitation capability for extended scenarios.

Step 7: Tools and Safety Items

A multi-tool or Swiss Army knife is the most versatile single item you can add to a kit. Beyond that, include: a wrench or pliers to shut off utilities, a dust mask or N95 respirator, work gloves, a fire extinguisher accessible near the kit, and extra cash in small bills. Electronic payment infrastructure fails during power outages, and having cash ensures you can purchase supplies when merchants cannot process cards.

Include copies of your household family emergency plan, evacuation routes, and the locations of local emergency shelters. For households with children, add age-appropriate activity items to reduce stress during an extended shelter-in-place period.

Storage, Organization, and Maintenance

A 72-hour kit stored in three different locations throughout your house defeats its purpose. Keep supplies in one or two accessible locations: a designated shelf in a garage or utility room, or large waterproof duffle bags that can be grabbed quickly during an evacuation. Your kit should be portable enough that one or two adults can carry or move it to a vehicle.

Label everything clearly. Use a waterproof marker to note expiration dates on food and medication packages. Schedule a kit review every six months — the spring and fall daylight saving time changes serve as a reliable reminder. According to research from Oregon State University Extension, households that review and refresh their kits on a defined schedule are significantly more likely to have functional supplies during an actual emergency.

After any major disaster event in your region — even one that does not directly affect you — review your kit and update it based on what that disaster revealed. Community emergencies expose gaps in standard preparedness guidance that are specific to your local hazard profile.

The kit is the foundation — not the full structure of emergency readiness. Once assembled, connect it to a broader preparedness plan that includes evacuation routes, family communication protocols, and evacuation drills. A well-stocked kit sitting next to a family that has never discussed what to do with it is only half a solution.