Still in the deep freeze...de-winterizing on the road?

How cold is it going to be? For black tank use I would just have some water in my fresh tank to flush with - doesn't matter if it is still mixed with the pink stuff.

Before you use the sink/shower/etc you are going to want to do your normal dewinter but that doesn't matter for flushing the toilet.

I have such a hard time getting the antifreeze out of the supply lines that I just blow out the lines now and don't bother with it.