Most of this has already been stated:
Tubs of Kool-Aid
Rice
Instant stuffing and canned chicken is good for 2+meals
Ramean
Mac and cheese, go store brand
If you drink soda, drink store brand, hell, get everything store brand
Sterlite and rubbermaid can be your friends
Become a regular at walmart at 2 a.m.
Dont go out to eat
Definatly plastic the windows
turn down the heat
make sure everyone cleans up after themselves
steal wireless internet
get lots of roomates, in rochester I lived in a house with 5 people and I only paid $190 a month, utilities are cheaper too.
When you trow parties, suggest someone go pick up some frozen pizzas or something, and make sure everyone pitches in, they will get lots of food and leave most of it behind
Cans and bottles can add up quickly, again left behind from parties
get a girlfriend and move in with her parents