Step 1: Obtain water. This is our main water supply, a sandpoint well with electric pump, insulated in this pump house and kept from freezing by a space heater on a timer.
Step 2: Haul water to shower and to water heating system (see Step 3). In the summer this step can be eliminated by running a hose to the shower.
Step 3: Heat water.
Step 4: Fill the shower tank. The tank is a plastic laundry tub with a drain. The Hermit fitted a pipe valve and a shower head to the drain. It takes about ten gallons of cold water, plus six gallons of boiling water, to make a ten minute hot shower.
Step 5: Enjoy a hard earned shower. Yes, I am walking barefoot in the snow; it takes too much time to put on and take off slippers, bathrobes, etc. And it's a balmy 20 degrees so I don't mind. :)
note: this obviously takes a lot of preparation and work, so to conserve energy, The Hermit and I shower together.