A hack that I thought I read here but now I cannot find it- water bottles filled with salt water for ice. I grabbed a 4L bottle and filled it with salt water. I made the mixture as saturated as possible and froze it in the deep freeze. This past weekend I used it in my food cooler and packed as much food frozen as possible. Sunday morning I had to put the back pack in the sun to be able to thaw it enough to cook.
I guess the science of it is with the melting point being -15 or so instead of 0 degrees; even when the jug is partly thawed it sits at that temperature instead of zero. 48 hours later we still had everything frozen. Now it wasn't that warm this weekend, but this could end up being a bit of a game changer.
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