I'm in Galloway NJ now. Also my first time winter camping. I'm in a class A mh. My water supply is attached inside a bay door. I have a 100 watt light bulb running 24/7 for a heat source, and heat tape running along the length of the hose with pipe insulation on top. The first night when it got down in the low 20's, I turned the water off and blew out the lines as a precaution. Since then I noticed that Noone else was doing any prep like that. Since then I haven't done anything other than run the bathroom sink at a trickle with no problems