How do I make meals for myself without refrigeration?

I'm going to be moving back into my dorm room in a week. The dining halls/meal plans will not be open at that time and I don't know if my microwave/minifridge rental are going to be delivered by that point. So, that raises the obvious question: how do I make meals for myself without any refrigeration?

I have a small crockpot and a waffle maker, so I will have the ability to cook in my room. But I just don't know what I can do without the ability to keep ingredients/leftovers cold.

Also, I would like to avoid frequent trips to the grocery store if possible! It's fine if I need to go every couple of days, but I certainly want to avoid going to the grocery store before I cook every single meal.

Thank you for your help :)

bon appetit