To keep your frozen water bottle frozen longer during the day, put it into one of those spare socks that have no mate. I was surprised at how much longer the water stayed frozen. I got the idea from remembering that my grandpa used to put his mason jar of cold well water into a wool sock to keep cold while he was harvesting.
By Katz
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04/07/2010
Thank you for your idea! I will be using it this summer.