The first thing to consider is that you need three days (or longer) of food which you can use while making preparations for a permanent food supply. Freeze dried food is quite light to carry.
Even though it is unlikely that an emergency would cut off your food supply for two weeks, consider maintaining a supply in your pantry. You can use the canned goods, dry mixes, and other staples on your cupboard shelves. Be sure to check expiration dates and follow the practice of first-in, first-out.
PREPARING AN EMERGENCY FOOD SUPPLY
As you stock food, take into account your family's unique needs and tastes. Familiar foods are important. They lift morale and give a feeling of security in times of stress. So rotate your supplies and cook "emergency" food recipes weekly. Try to include foods that they will enjoy and that are also high in calories and nutrition. Foods that require no refrigeration, water, special preparation, or cooking are good.
Individuals with special diets and allergies will need particular attention, as will babies, toddlers, and the elderly. Nursing mothers may need liquid formula, in case they are unable to nurse. Canned dietetic foods, juices, and soups may be helpful for ill or elderly people. Make sure you have a manual can opener and disposable utensils.
Don't forget nonperishable foods for your pets.
Long-Term Food Supplies
In the event of a national disaster, you will need long-term emergency food supplies. The best approach is to store large amounts of staples along with a variety of canned and dried foods. Bulk quantities of wheat, corn, beans, rice and salt are inexpensive and have nearly unlimited shelf life. If necessary, you could survive for years on small daily amounts of these staples. Don't forget spices and vitamins.
Some Interesting Food links: