Thanks for the suggestions.
What my rats are doing is chewing holes through the
cage bars.
They can't make huge holes (I house rats in martins cages myself) but it's enough to ruin the water bottles

& It was making me upset,hehe.
WhiskersNTails - thanks as well,I had no idea they even existed

But I can look into those as well.
I like to have a few spare water bottles just in case.
I currently have 2 non-chewed bottles...that I'm not using yet.
I'll have to pick up those hangers that guard the bottle from being chewed.
Thanks guys!!