A old fashion way of staying warm in a emergency or for everyday comfort.

Dave -- -- If you have bricks that are washed clean, put them on the wood stove to heat up. Wrap them in an old towel and put them in the bottom of your bed.

Not as nice/soft as hot water bottles, but will serve the same purpose.

Also, you can carry a few hot bricks to be put onto towels on floor of bathroom early in morning and if you keep the door shut, that heat will warm up the bathroom so that “doing your business” is not so frigidly bothersome.