That's how I do it with our Encounter. I disconnect the pump inlet side and connect a hose to it that came with the coach. I put the other end into the bottle of antifreeze and turn the pump on with the switch in the wet bay.
Don't forget to drain the water heater and set the WH for bypass operation.
I made a list of tasks associated with winterizing if anyone wants to see it; also a diagram of bypassing the HW although that's fairly simple really.
Gary, Cindy, Reacher (Maine Coon), and Vivian (in spirit only now).
Retired: July 31st, 2013 and loving it.
2011 Coachmen Encounter 37 TZ pulling a 2012 Wrangler Unlimited Sahara. Many upgrades, additions, mods, and changes.