But you're talking about "plastic" bottles, right? I'm not sure what happens with thin aluminum when it's thermally stressed (and especially when it goes through many freeze/thaw cycles). The FAQ states that it's possible that a bottle could crack just from being in contact with ice, on the outside, the contents presumably still being a liquid.

This is probably something I just need to try. Kinda' hate to make scrap out of a $20 bottle, but heck, this is SCIENCE! <img src="/images/graemlins/smile.gif" alt="" />