Hey, I don't know how much of a help I can be, because i'm in my second year myself, but i'll try.
Well, it's going to be really hard living off of only that everyday. Try to make some good friends during the first few weeks, so that you have some places to go to. I'm a bit confused by how you wrote it, but you're living in the halls? as in you don;t have a room? if so, try to ask your friends if you can use their microwave, unless your college has a kitchen type room with those available.
I would also suggest looking online for cheap food solutions so that you can find some weekly meals to make. try not to buy fast food etc, cause it's way more expensive...bring what you need with you, but also bring some things you enjoy with you as well, like your 3ds, and maybe a pony. it's comforting to have something like that near you, because times might get rough...
Always let your profs know whats happening, if youre going through a rough time and think you can't finish something on time, let them know and ask for an extension, most profs are willing to help.
Let me know if you have any questions.. hope this helps