I keep a year's worth of basic foods in my house. I learned how to buy and prep from a Mennonite woman. We also have years of freeze dried foods thanks to DH. LOL. DH came home one day with several pallets of the stuff he bought from a small company that sold freeze dried foods. He said the man had to sell the inventory to make his payroll and it was too cheap not to buy and help him out. It says it's good for up to 25 years or more. The kids think it's great camping food.
If you find a copy of More-With-Less Cookbook, it's great for food storage cooking. 500 recipes from Mennonite kitchens that tell us how to eat better and consume less of the world's limited food resources.