Pretty much tough **** mate, most people have to get a job to support themselves at uni, my parents have a relatively high income but they don't have really any expendable income.
Just be as best prepared as you can, take it from a guy who's been unemployed at uni for the past year. It sucks, get as much saved as possible and make sure you have your CV primed and ready because it's a ****ing battleground in student towns for part time work.
Nothing worse than living on a diet of plain rice or having to sell DVD's to buy toilet paper.