We had a seasonal camp in Maine and loved to go up for long weekends in the winter, even without running water. We’d bring enough water to drink and heat up for washing, and we kept a 5 gallon bucket in the bathroom with a toilet seat on top. We’d put a little water in the bottom and dump it when/as necessary. I loved those trips...
During the week, we used a basin and wash rag to bath on the back porch, or in the summer we used a watering can outdoors in a sheltered place behind the house where passers by couldn't see.
I loved going to Granny's. It was kinda like a camp-out in the house.LOL