Are you sure you want to De-Winterize right now?
Awefully cold in your neck of the woods. Not so bad here (today its only 32 deg HI but 40's, 50's then 60's on SAT for Arkansas).
For day trips or weekend trips in the winter we just bring a couple of gallons of drinking water to wash our hands/face with and to drink and flush tolet with.
But make sure you add a little RV antifreeze with each flush / washing. I try to do a 50/50 soluton (Water/Antifreeze).
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, Fresh water surge tank, Black Tank Tornado flush, 4999 zip ties.