I had a pet rat in 05-06 before I moved to Alberta. She was so sweet. She liked to sit on my shoulder, play with my hair and rest her front paw on my ear while I washed the dishes. Sadly, we lost her, our hedgehog and our cat in a housefire just before moving to Alberta.
A better set up is nice but if you clean the water dish and change the aspen as your nose demands, it will be fine.
The mouse breeder that our store buys from feeds all their stock dry cat food.