my advice: get a microwave if possible
1. When you are hungry, you can microwave potatoes which is very cheap and easy, not to mention filling (note: you have to slice them open into at least 4 parts first).
2. You can boil water in a microwave and eat ramen should the need arise.
3. There should be rather cheap canned soups that you only need add water to and microwave. Some of them taste strange but you can probably find a taste that you can tolerate.
The above is my very-cheap-very-unable-to-cook-anything-to-save-my-life solution to the problem.