When I am done with each trip, I open both cold and hot faucets in sink, shower, and outdoor shower. I then open the low-point drains. This empties the water lines, except between fresh tank and the nearest faucet. Once fresh tank is drained, I run the pump for a few seconds, and cycle my toilet-flush button. Gets enough water out of everything that I have not had frozen pipes anywhere.
Yes, you need the low-point drains thawed when you do that, but so far I have been lucky, and days are above freezing.
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