I Have Cats

I started taking care of a cat yesterday (not a kitten a cat ) I live in my university dorm and I guess the cat was previously familiar with humans. I was planning to take care of it and have serious problem with deciding a food for it. (it was eating bugs yesterday and I guess it liked them but its April and most of the bugs are inactive at this time so I guess I will have to come up with something else) any suggestions ?