Residence has a bed, closet, desk, chair, shelves and a lamp. So you don't need to get any of those. Before they used to allow you to get your own mini fridge but I believe they changed the rules and now you have to rent one for about $110 for the whole year.
Edit.
I was right.
"Effective September 2011 students will not be permitted to bring personal refridgerators into the residence buildings."
refer to this page:
http://http://housing.mcmaster.ca/Residence_Admissions/Res_FAQ.html#7