My relief Debbie provided the shower curtain, she made it out of a tarp, it uses Velcro to attach to the catwalk and cab, when it is not in use it folds up and attaches to the shutter.  I used a 12v bilge pump to pump water out of a five gallon bucket to a showerhead.  Halfway through my shower I refilled the bucket with another bucket of hot water I had waiting.  I used a radiant propane heater to keep the enclose warm in the wind.  Before my shower I would use pans to heat up water on the stove.  I was able to have a nice comfortable shower with 10 gallons of water, although it did take a little time to get ready.  In the long run I would rather take the time than not take a shower at all...