Many of these foods are simple meals that require you to add water and heat (such as MRE's, or Meals Ready to Eat). However, if you buy individual bulk ingredients you can create more of a gourmet pantry which allows you a much greater range of meals to prepare—powdered eggs, spices, all sorts of flours, honey, etc. These foods are not only great for food storage but also for camping trips, especially if your camp kitchen is serving a large crowd.
There is one important aspect of planning your freeze dried food storage: try some sample meals before you invest in a six month or one year supply of one particular brand. I have my own preferences that you are welcome to use as a guideline (check out Mountain House or Legacy Foods) but there are others. Also keep in mind that some kits are chock full of sugary drinks and other fillers. Yes, you will need some beverages but they should not comprise 40% of your daily caloric intake.
After 9/11, my dad filled a duffel bag with some energy bars, a couple gallons of water, some penicillin, and a map. Amid scaremongering headlines about imminent anthrax and “dirty bomb” attacks in the city, he wanted to have some supplies on hand in case we needed to get out of Brooklyn fast. Were he to assemble such a bag today, he’d likely stumble on a number of companies promising a more wholesale brand of disaster preparedness: a box full of shelf-stable freeze-dried meals, to be revived from their dessicated state with the addition of boiled water.