Hard wheat, honey, salt, powdered milk.

About 50% of the nutrition of wheat is lost in 2-3 weeks after it is made into flour. So you need a non-electric way to grind it. A 5 gallon bucket will hold enough of the fab 4 to keep a family of 4 going for about a week or so. Add canned meat, fruit and veggies and you can stretch it to a month easily. Add a one a day multi-vitamin and you can survive, in good health, for years.

Try making some campfire biscuits using the fab 4 BEFORE you may need to for real. They actually taste pretty good.

If you have a dog, make sure to keep a month worth of food for them.