My emergency plan is using a 12VDC TANKLESS air compressor that I can connect to the CITY WATER connection and blow out all of the lines by opening each of the inside faucets. Then when I have all the water out of all the lines I only a small amount of RV ANTIFREEZE to the P-TRAPS. Using the tankless model small air compressor doesn't start out at high pressure and gives you plenty of time to hook up and open a faucet somewhere and not worry about over pressure in the PEX tubing water lines. The portable air compressor is great for airing up the trailer and truck tires as well.
We have done this on several OFF-ROAD camping adventures when it gets below freezing at night. Only takes a few minutes to accomplish this...
Then we can add fresh water the next day and go about our business as usual.
Roy Ken
