I'm getting that if the water bottle is outside the tub that should help.
I'm picking up a wheel today and I did put more stuff to chew inside the tank yesterday. So far that is seeming to help keep them off the water bottle. Aty least until I can change my set-up.

I'm also thinking of starting a small rat colony too. Argentra, Do you still have your rats? How did you stop them from chewing out?