Welcome to the forum!
We spent a few months-long stints in Dallas/Fort Worth several times for my job 2015-2018. We had a few 20* days each winter. I bought a heated water hose. We used the furnace and electric fire place plus we had a ceramic heater. We had no problems.
The folks here that live in cold climates will offer better advice. Fill the fresh water tank and use water from there using your pump. We have an on demand water heater so the heated hose worked better for us.
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MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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