Also remove all the water filters if you have 'em otherwise the pink stuff will stay in the filters. Also, if you have access to compressed air, it's helpful if you blow out all the lines by blowing air into the external hose attachment and then going around to all the faucets, etc and letting air come thru. A short hose, like 6-10 inches long can serve as an adaptor to the air nozzle.
There is an alternative to dumping the "pink stuff" into your fresh water tank... next year... after you find the water pump you can use it to pump pink stuff to all the outlets.
Also, don't forget the "P-traps" in all the sink/shower drains.
Also, either drain the windshield washer fluid or get some that is good to -20.
Also, any canned food you leave in the RV will freeze and could break the seal... then when it thaws, you'll have a big mess. This goes for any other stuff, like sodas, hand lotions, some liquid soaps, etc.
the reference in the forum library covers all of this.