Hmm, when broke I found I had trouble eating the way I wanted to. Probably some repeats but some things to think about:
- bulk oatmeal
- bulk rice
- bulk beans
You can cook up a ton of beans and rice then freeze it in portion sized containers. Optionally add some meat and spices, nuke it, and away you go.
Peanuts aren’t as cheap, but they have a lot of calories, and can last a long time if you ration them.
Pretzels are also reasonably cheap, and if you are doing a P+C meal are a convenient source of carbs. I’m sure they are high GI but if you want cheap and convenient it might still work for you.
One of the difficulties of course was finding cheap meat products. I was able to get sausages at a good price, but then you are dealing with a lot of fats as well – which made them a standalone meal for me. Some of the cooked hams were good on a price/lb basis too.