Vodka in fresh tank?

Never put margaritas in a blender.  Always use crushed ice and shake.  Also, no margarita mix.  That stuff is awful.  My favorite tequila:  Heradura Reposada - best to sip from a shot glass, salt and lime are ok, not necessary.  It's the finish that's so good.  

I knew this would be an entertaining topic. Keep it coming.

An alternate recipe:  5 bottles of tequila, 2 bottles of Contreau, juice of 1 dozen limes, 3 lbs. crushed ice (to clean the capacity sensors, of course) and 1 cup of coarse sea salt at the sink.  Same driving requirement as GlueGuy's recipe, but a different flavor.

Originally posted by Gregm The lemon or lime juice is a good idea. It is kind of hard to stuff lime wedges into the fresh water tank. Trying to get them out is even harder.

They would for sure get caught in the aerator at the sink.

Carry water in a separate water carrier that you can keep in the heated space. Carry RV antifreeze to use to flush #2. It isn't needed for #1, but a little RV antifreeze to help keep the flush valve wet is good. Minimal use of gray water tank and some added RV antifreeze will protect that. Use of alternate clean-up materials such as the large wipes like those used in hospitals for clean-ups is one way to avoid requiring lots of water for personal clean-up. This is what we did on our last winter cross-country trip.

For the fun side: I should think you might want to add some lemon or lime juice to the tank if you go the alcohol route for flavor.