OP, I really don't understand your food choices. Even if you do not have access to a stove or microwave you can get a lot of meals from one container of store brand oatmeal & water.

16 oz of off-brand oatmeal is about $1. Add a teaspoon of peanut butter for more protein and a little fat. (Sounds weird but it's really tasty.)

Far more filling & nutritious than processed soup, especially if you can find any distressed/marked down fruit to add in.