In my teardrop, running the heater buddy for 15 minutes every 90-120 minutes, then go back to sleep, will get you thru a night below zero. When it gets cold enough, you will wake up. It never runs while I sleep.
Beyond that, heavy flannel sleeping bag, wool socks and a fleece cap does the trick.
For outside living we run a bonfire while in camp. I have a 55 gal steel drum cut in half with vents at the base like a rocket stove. Bring plenty of wood, or be prepared to cut and split if thats allowed where you are (BLM, NFS).
I also have an easy up shelter with walls, and a “cannon” style propane space heater. 10 minutes from the 20’s to the 70’s, set up table and chairs for cooking, cards, dressing, etc. and you get warmer faster than if you have to start the bonfire from scratch.
There is a school of thought that advocates putting the easy up and walls around your teardrop if you can. I haven’t bothered, but it would certainly buy you a few degrees.
The problem with water bottles and blankets alone is this: when it all cools off at 3am or whatever, you are cold. Are you prepared to get up and boil more water before going back to sleep ? I’m not. I can roll over and start the heater buddy, read a few pages until the space is warm again, and I am set for a few hours more.
Running a generator to give you shore power for an electric heater is the least efficient use of fuel and the noise will keep you up if you are letting it run all night.
As far as pee bottles go, best practice is wide mouth gatoraide, and and nobody ever mistook the blue gatoraide for a full pee bottle. The same cannot be said of lemon lime. DAMHIK. If you can get away with the narrow mouth, congratulations, I guess.
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