welcome to the primal community, and congratulations on going to college. i'm guessing the dining hall will create a challenge for you...there's usually tons of food, most of it non-primal (stock up on supplements...fish oil, vit. d, acidophilus) but if you stay up with mark's updates and the forums, we'll help keep you in line. as for what to keep in your room...nuts, nut butters, some fruits and veggies, and maybe some jerky are good options to have around. the usual college diet is packed with non-perishable foods which are generally not part of the PB. so while your roommate is shoveling easy mac and doritos into his mouth, you may want to keep some pistachios tucked away so you have something healthy to munch on during halo tournaments (personally, i think mario kart is better for dorm room fun).
alcohol...well, that's a tough one. you're in college, and you should go out and have a good time. red wine is probably the best for people on the PB, but you can play around a bit. just watch out for those mixers, because they are packed with sugar. if you're going to party, just party. just don't do it too often and don't be stupid about it. you don't get in trouble for drinking, you get in trouble for getting caught.