Water -The most important thing to have is enough water to last for 72 hours. This includes water for washing, drinking and cooking. Different countries have different recommendations, but the US suggests 1 gallon per person per day. If things go bad, be sure to have water purification tablets handy if you need to make safe drinking water.
Food – Non-perishable food & Cooking supplies. Depending on what type of exertion you may face, try to supply yourself with a minimum of 3200 calories per person per day.
Firearms and appropriate ammunition (Personal defense is almost as critical as water. If the disaster is bad enough, people will attempt to take what you have…with no regard for you. Remember New Orleans after Katrina? Exactly!)
First Aid Kit – Go beyond you basic walmart band-aid kit. Make sure that it has essential materials to treat severe wounds.
Fire starting tool (e.g., matches, ferrocerium rod, lighter, etc.).
A disaster plan including location of emergency centers, rallying points, possible evacuation routes, etc.
Professional emergency literature explaining what to do in various types of disaster, studied and understood before the actual disaster but kept for reference.
Maps and travel information.
Standard camping equipment, including sanitation supplies.
Weather/seasonal appropriate clothing (e.g., poncho, headwear, gloves, etc.).
Bedding items such as sleeping bags, blankets, or emergency blankets.
Enough medicine to last an extended evacuation period (prescriptions included).
Medical records, marriage records, etc. (These are good to have your home suffers damage).
Pet, child, feminine, and elderly care needs.
Battery or crank operated Radio.
Lighting (solar or crank operated flashlights are best. Batteries will go fast.) Glow Sticks can illuminate well and last for a long time.
Cash and change, as electronic banking means may not be available during the initial period following an emergency or evacuation. To be safe, $300 – $400 dollars per person would be best.
Positive Identification, such as drivers license, state I.D. card, or social security card
Fixed-blade and folding knife. Multi-tool.
Duct Tape and rope/para-cord.
Plastic tarps for shelter and water collection.
This is just a list of survivalist recommended items to sustain you for a 72 hour period. As mentioned earlier, things will vary depending on you family size. Preparation is the key to success and this is no exception. Better safe than sorry, right?