My son’s school is one of the top ten and they don’t serve meals on the weekends so the kids have to fend for themselves. It’s a small school and everyone knows everyone in the residence halls.
The classmates, with cars, work together with those that don’t, to create their own shopping lists and run to Safeway. They have full sized kitchens in each hall, so they stock up the fridges on weekends, then make/freeze meals whenever they can. BTW: getting six hours of sleep per night is a luxury for them.
Additionally, the roommates all have packages, sent by their parents, of favorite regional foods and they share. They’ve asked their parents to send extra foods. My son’s roommate eats a lot of trail mix, so he’s had his mom ship tons of trail mix. My son eats easy-to-make Mexican food and top ramen. So, I shipped him Costco-sized corn tortillas, and rice, and top ramen. I sent him a gift card for Safeway (for his quesadillas: Monterey jack cheese, sour cream, cilantro, lettuce, chorizo/eggs, etc.)
It’s not hard to eat at a school with crappy food. It is not hard. Every poster has given you some good suggestions.
Given your previous post referenced by @TomSrOfBoston, I think there is more going on than you trying to use “not liking food at your school” to get sick. Talk to a counselor because you really may be depressed. BTW: Seeing your high school friends having “fun” at their schools, doesn’t help and it means their grades may be weaker than what they say.