Hi Chris,
After years of living in the frozen northland and frequent winterizing of RVs, here's how we handled the UNwinterizing: Assuming you don't have a hot water heater full of the pink stuff, fill the fresh water tank (add a couple tablespoons of bleach; really, it doesn't take much), and run water out of all the faucets until the water doesn't look foamy. Fill the tank again; if you smell the bleach in the water, mix a couple tablespoons of baking soda in water and add that to the tank. Run some more water. That's it. With the smaller water tank in our 25, I put about a capful of bleach in the water when we're sanitizing it.
If the hot water heater has the pink stuff in it, it will take a lot more flushing to clean it. It's best to drain it and add water with the drain open.
I've never tried the vodka technique... I'm guessing you don't have to go so easy with the amount you add with that. :wink
Best wishes,
Jim B.