>>2672090In a lake or stream if I can find one that's only lightly iced over.
If we're car camping or camping from one store for an extended period we'll take one of those camp showers with a bag you hang from a tree and fill it with warm water from melted snow.
Failing either of those sponge bath using a flannel and melted snow or just wet wipes in the tent if it's really cold.
