I check water bottles everyday and usually refill with fresh water every other day

I clean their enclosures once a week (wood pellet are very efficient and cut down on the smell)

Does anyone keep rats in their room where they sleep?
I would not recommend it if you want to sleep they are noisy.

If you have space problems and want to keep a colony of 10/14 rats a rack would be the best way to do it. (Take less space and is easy to clean)

http://stewartreptiles.com/Articles/...eding_Rack.pdf