Tha's a good point, Gravdigr.
I use a similar strategy by taking my water bottle (Nalgene, 1 liter) and filling it partly, say, 2/3. Then I put that in the freezer, lying on it's side so I can have room to get the water in and room to swirl it about when I fill after it's frozen. Now that I think of it, I should have two of these in rotation.
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Be Just and Fear Not.
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