The Camping Part Is Great...Winterizing Though.......

I don't blow lines first , just pump red pop ,anti freeze, one gallon . Once done ,open low point drains and that anti goes in traps and toilet bowl. Usually 20 minutes.
And for the city water intake. After pumping anti, open a tap to release pressure. Put your finger in check valve and have someone turn on pump for a couple secs till pink comes thru.