We winterize at home, in such a way that it doesn't take anything to De-Winterize. We do use compressed air and also Antifreeze. We fill the lines and drain pipes with A/F. But do NOT put any A/F in the tanks, and water heater.
When we get to a warmer climate we hook the city water and open the low point drains, and run the faucets for a few minutes after the pink has run out. Then I open the water heater drain and run water in there until it runs clear. Tighten the drain and fill the water heater. Then put about 20 gallons in the fresh water tank.
Done. About 20 minutes.
De-Winterizing you only need to worry about incoming water. Not the drain side. Or the toilet. The secret to quick and clean De-Winterizing, is to make sure you winterize in a way that makes de-winterizing quick and clean.