As I remember from my dormitory days, the salad bar will be your best friend. There should be self-serve oil and vinegar on it, plus veggies. There are certain ones to stay away from (very limited amounts of peas, carrots, corn, etc.) but many you can eat a lot of (broccoli, mushrooms, tomatoes, lettuce) and can boost your good carbs with chickpeas/garbanzos. Our college had bread and cold cuts for when you didn't like the daily choice, so I used to get turkey every day--this would be a good protein. Cottage cheese also. Breakfast would be a time to stick with eggs, lean meats (if there are any) and fruit--avoid pancakes, toast, french toast, etc.
Also, find a close grocery, or a friend with a car to take you to one, and put a few supplies in your room. Balance, Zone Perfect bars (and some others) need no refrigeration. String cheese, cottage cheese, fruits and veggies can be kept in a little fridge. Apples need no chilling, and they make little cups of applesauce that are exactly 1/2 cup (1C). I also love buying my broccoli already cut into florets, a brand we have here is Broccoli Wokly, and is more expensive, but you are not paying for lots of stalks. Sears also has tips for pizza times (although this is not great, it can be zoned occasionally) in A week in the Zone. (I think it was order pizza with lots of veggie toppings, and don't eat the crust of every other piece, but don't quote me.)
And drink lots of water!