I made a spreadsheet to track several data points.

• Calories per dollar * I excluded fiber from the calorie count
• Calories per pound
• Protein per dollar
• How much water needed to cook it
• How many pounds I have in inventory
• Total calories in inventory.

Maybe there's an app to do that, but I don't trust phones.

Here are some things I found from my spreadsheet:

• The cheapest (healthy?) calories are white rice.
• Next, sugar, flour and high sugar foods like cookies.
• Dried beans have less net calories per lb than rice due to their fiber and cost more per lb. They are still a good food to store.
• Nuts and dairy give more calories per dollar than canned meat, but have reduced shelf life.
• You will want some foods that are expensive per calorie like meat, fish, cod liver oil, yeast flakes, fruit etc. Spam was one of the cheaper meats when I did the calculations in 2020.

It's worth checking "dollar" stores, restaurant supply stores

We don't that much protein? http://www.fatfree.com/FAQ/protein-myths

Download an offline copy of Wikipedia and other sites with Kiwix. https://greatawakening.win/p/140cNWK90K/kiwix-download-gutenbergs-public/ You may also want a pdf package like that linked by Dreadnought. You may have an old phone or computer to dedicate to this. Store it in a Faraday cage. Just get a small metal garbage can with a tight fitting lid and line it with an insulating material, maybe cardboard. Label it so you or others know that it's worth charging up that device.

Make sure you have plenty of WATER. And you need to have fuel to cook all the food. A pressure cooker can save fuel. And maybe some paper plates to avoid using water to wash dishes.