Found it!
On my 38re there’s a valve in the wet bay that you turn to “winterize.” Then you can connect a short length of hose to the city input and dip the other end into the antifreeze jug.
Then just turn on the water pump and within seconds you’ll have pink flowing from spigots.
My rv took about 4 gallons to completely do 4 sinks, 2 toilets, 2 showers and the fridge.
Thanks all!
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