I have solution for this but I have not tested it yet. I keep a small cooler, water bottles, tin foil, and an emergency candle. I would line the inside of the cooler and wrap the bottles in the foil, then try to melt with radiant heat from the candle. Seems like it should work.
If you just keep the bottles in the cooler, they will never freeze. Im a contractor so I have water with me year round. Stays pretty constant temps in the cooler.
It does eventually. It takes a lot longer, but once we hit a week of straight of weather in the 20s, it will be frozen for sure. If you're just taking water out with you for the day then it won't, sounds like that is what you might be talking about. I'm keeping a case in the trunk and I don't touch it.
I leave my water in a cooler in my truck bed all winter and it will never freeze. I live in a cold-winter climate average of 15 degrees or so
Candle will use all the oxygen in the cooler and then go out. You can also calculate the fuel needed to melt a certain amount of ice and it's nontrivial.
Fire is the answer, maybe a butane stove.
I wasn't planing on closing the cooler.
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