I don't use the pink stuff per say. We blow the lines out with air. (fitting at Walmart for $2.50 if I remember right) Put pink stuff in the P-traps drain lines and a little in each toilet to keep the seals wet. Drain my fresh water, gray and black tanks (about 1 gal plus chemicals to fight the stink in the blacks) and call it done. Don't want to flush lines in spring. We drink bottled water but still wish to avoid chemicals. If it's only dropping below freezing at night (say 25) and up into the 40's or 50's during the day I don't worry about it. My tanks are enclosed in the belly of my camper and the heat ducts (when running) keep the plumbing from freezing by heating the underbelly. What the real concern is a hard freeze that will bust valves or P-traps in the drain lines. The tubing they use will expand and tanks will expand if they only have a little bit in them. It takes a good freeze to cool the camper off to hard freeze everything in it. Unless temps drop below freezing and stay there for a couple of days I don't worry about it.
If your sleeping in it and only dipping below freezing at night I would not worry about it. Also if you are moving things will tend not to freeze. Often times if you had a freezable load in the semi if you idled the truck the vibration from the engine would keep the liquids from freezing.
Since it's already winterized I'd take a gallon of water to flush my toilet and flush it all out when I got to Vicki's
Vodka could be a DUI issue
Sorry office just drinking water