Heat?

Hey guys, I'm from Ohio and I do like to do some cold weather camping. Since this is my first build, I don't have the experience with heating one of these.
Since I mostly camp without 120v, I need to heat some other way. just enough to keep me and the missus warm and to keep the water from freezing.
any suggestions? Particularly on the water issue. (to anticipate your questions (a 15gal tank mounted in the galley cabinets with a little space to insulate the tank)
Since I mostly camp without 120v, I need to heat some other way. just enough to keep me and the missus warm and to keep the water from freezing.
any suggestions? Particularly on the water issue. (to anticipate your questions (a 15gal tank mounted in the galley cabinets with a little space to insulate the tank)