Check every 6 months for food expiration dates, children's clothing sizes, etc. Start with what you already have. If you're a camper or backpacker, you've got a head start. Your tent, cook stove, and other gear can double as emergency supplies. Use canned foods for easy storage and long shelf life.
Unrefrigerated leftovers can lead to food poisoning.
Don't forget your pets. Store canned and dry pet food along with an extra collar and leash. Pets are not allowed in most shelters. If evacuated, you may have to leave them behind with extra food. Add a manual can opener, cooking and eating utensils, and basic food seasonings.