Most schools (that I've applied to, anyway) provide a minimum funding package for PhD students, somewhere in the $20,000 range per year including a TA-ship (which usually makes up around $10,000). If you're a competitive applicant the guaranteed funding usually exceeds that. Some PhD students have external funding or extra fellowships on top of that, but certainly not all. The problem you'll have is that you'll be paying international fees and so most of that funding would go towards tuition. If you manage to become a permanent resident in Quebec, the fees drop enormously (even in comparison to other places in Canada), but my understanding is it isn't easy. You will definitely need to apply for some other fellowships or programs and you may find some really good funding (Vanier and also Trudeau are two options)! On the plus side, I think the cost of living (even in Montreal) is substantially lower than cities in Ontario.
I hope that helps a bit!