My daughter is at college and eats gluten-free.
She eats things like yogurt and fruit for breakfast.
For lunch, she eats salads.
I think it depends on the school. We buy her the cheapest meal plan and she buys what she can eat at the convenience store and food courts, then she has a small refrigerator and a microwave in her room to cook food from the grocery (I always buy a bunch of stuff for her when I visit). She's fortunate that the convenience store that takes her meal card sells Amy's meals.
She keeps things like ham and cream cheese (makes roll-ups), yogurt, gluten-free bread, snacks, etc. in her room. She also manages to spend all the meal points ... probably due to the fact that there's a Starbucks that takes them!
She seems to have no problem with it at all.