What's the solution to my water bottle problem?

I play racquetball every day. We’ve been taking bottles of water down that have been partially frozen for our in-between-game hydration breaks. I’ve been getting the bottles of water for free, but that’s ending soon. So. I’m not a big fan of bottled water anyway, so I need some sort of awesome sport water bottle(s), and, more importantly, some sort of system to freeze/thaw the water (how many should I keep in the freezer? When to take them out, etc).