The rice thing sounds really good, will have to give it a go. The bit they drink from never seems to look chewed or mishaped but they still leak! tut dont make them like they used to, we have gone through a fair few... its craters babies that are the problem, Crater hasnt taught them the proper way to drink so it sounds like a machine gun.
Willie has had the same water bottle for like forever it seems. He isn't a chew needless to say he doesn't ever chew a hole in or around them causing them to leak.. However, now that I have said this he'll probably do something to a water bottle this weekend right? However, he does have a few different bottles that I rotate every once in a while. I like the rice idea though and may give that a try sometime too. Thanks for the idea... 8)