I'm not saying don't enjoy yourself or spend some money, just don't waste it - invest it and if you fall short, draw from it.
Don't clock yourself up with debts before you can even afford to pay them off.
So, enjoy yourself by not wasting money and investing it
Unless you get off on watching your bank statement or stocks and shares i dont think this is possible
Most people who go to uni dont have a 50k a year job lined up so they can pay their student loans off.
As already said, dont buy stupid things you dont need, go out and have fun with it like everyone else and spend it on normal things like clothes. Nights out out can be done cheaply at uni, drink in, straight out to a club or an all you can drink place
Dont bother buying books either. Thats what the library and the internet is for. The only book i bought in 4 years was a project management course. I ended up getting 23% on the course work. Luckily I pulled it back to a dead pass (40%) with a half decent mark in my exam