povertypoint - I would use RV antifreeze. Lift up hoses of the water fill, turn machine on the warm setting and funnel it into the hose till the Rv antifreeze shows up in the tub.
Turn off fill, dump half a gallon of Rv antifreeze in tub and set to spin so it
dumps through the pump, lay the hose down on the floor to drain out
Should be good for winter. :)
I think it will be a lot better when you use it again, and it needs to be something compatible with potable water. Plus it is usually cheaper.