A hot water bottle (or hottie[1]) is a container filled with hot water and sealed with a stopper, used to provide warmth, typically whilst in bed, but also for the application of heat to a specific part of the body.
I thought I’ve read people suggest doing something like this to stay warm while camping
found idea at / credit to Low Tech Magazine but their article has immodest pics so wasn’t gonna link it
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Who cares about camping, these things are great to bring with you in a cold, arctic bed.
Also, why use a bottle when camping? Hot stones from the campfire in a fabric bag keeps you warm, real low tech style.
