I'm a full-time student and although I have had some form of casual employment since I was 15 (I'm 21 now), I haven't had a job since late March. I currently live off my Centrelink payments of $220 a week. Thank goodness I qualify for Centrelink because I went through the first year of uni without it. I was living off only a smidgen more money but working 16-20 hours a week and paying more rent.
Now, $105 goes to my rent (which is very reasonable), then let's say about $15 goes to internet, phone and electricity costs. That leaves $100. I'm part of my local CSA (so fantastic!) and I get a 'mini box' of fruit and veg for $30 a week, I also buy dribs and drabs at the supermarket but I really try to limit that, I'm vegan so I don't buy meat and dairy and I prefer to buy dry beans and grains in bulk every few months so I always have a decent supply. I nearly always cook everything from scratch. So, let's say I average $50 a week on groceries (including my veggie box), that leaves $50 for 'other' expenses.
I'm still learning about budgeting and to be honest, I can't really tell you where that $50 goes. Books, clothing, to replace things that have broken, a meal out, a drink or two...let me tell you it goes really quickly! I have a new-book-buying problem but I'm also a big fan of libraries, so I try to use them more. I rarely buy new clothes but I op-shop fairly often, I don't always buy things but I like to have a look. As I educate myself more I'm realising that I want my purchases to reflect my ethical values, rather than my impulsive consumerist whims.
I thought I would live off Centrelink for a while just to see if my grades improved without the stress of a job but I think the stress of having no money or savings is much worse. I'm now actively job-hunting.
Edit: I forgot to add in transport! I spend about $10-12 on my go gard (South East Queensland trains, buses and ferries) per week. So that takes my 'other' money down to $40! It's tough. I've thought about dumpster diving for food but I love my CSA too much.