Thanks for the replies. We're here now and getting ready for bed. I've disconnected the supply hose and brought it inside for the night. I did put some water in the fresh water tank for toilet flushing purposes overnight. Hopefully we'll be good in the morning.
I did look online at heated hoses. I might pick one up sometime. It seems like a handy thing to have in your rig.
2015 Rezerve RTZ28BH
2014 Ram 3500HD Laramie, Crew Cab, 6.7L Cummins, 6speed auto, 4x4