I went to buy a plastic water bottle that has a tube inside that you frezee, and keeps the water cold they don't have anymore they sold like hot bread. I been looking everywher, and only found a place Alibaba that sells them wholesale only. A Hello kitty in OKorder which is not the one I want . If anybody knows wher I can buy i will appreciate a link or name of the place.
You can keep water cold without having to use the frozen tube. Just buy a double wall insulated bottle and that should do the trick. If you want an extra layer of insulation, you can always add on an insulation sleeve too.
I've seen them at Wal-Mart in the sporting goods section
