Based on local advice in Grand Junction CO where they have a lot of oilfield workers and sell a lot of heat tapes, hoses, etc, I bought a black polyethylene water hose and a heat tape at a True Value hardware store.
Be sure to check the instructions with the tape, because some specify that the tape should not be spiral wrapped, but simply taped along the length of the hose.
I used sections of foam pipe insulation with sticky edges - there is a plastic strip that keeps them from sticking until you are ready - to cover the hose with after installing the heat tape. I covered the butt joints with duct tape.
This has served me well for eight full timing years.
Of course I try hard to never have to use it, but sometimes you just have to be in a cold place for a while.