While I was at uni I used to teach flute to help make ends meet - if there's a uni music society, put a card on their notice board, or put a card on the music department notice board. If you have any skills you can offer in return you'll be surprised how cheap lessons can be... even something as simple as typing up essays. If you find someone who's involved in organising a student society, offer to help do the boring bits in payment for lessons. I used to run a student orchestra and would give my students a free lesson in return for helping me publicise my concerts, writing my programme notes, running the interval refreshments, helping me set up the stage, giving me a lift home after rehearsals... I used to find all sorts of jobs for my students in return for tuition.
So far as pianos to practise on go - it's worth checking any churches on or near campus. Many churches have pianos and will let you play them in return for either a nominal fee or some sort of payment in kind. I used to teach flute in a church, so I had a piano for accompanying or demonstrating if I wanted it, and they used to let me teach there in return for helping out with coffee mornings and other events. It was great, the accoustic was wonderful...
A note about practise rooms though, even if you can get the use of one to practise, if you get a student teacher you may find the university won't let them teach in the practise rooms (the logic being, the university is laying on facilities and someone is using them for personal gain. You can see how the university accountants will find that thought upsetting!).