When tent camping, I have used a garden 1 gallon pump spray tank (new) with an old
solar shower on-off shower head. Heat up 1/3 hot water, add to the cold water in the tank, pump it up and have a nice, hot shower. The spray tank hose also has an on-off switch. I use a pop up shelter with this.
Solar shower bags work, if you have a good place to hang them.....and that is not always available. This works anywhere. I have used this in my
Casita when I did not want to de-winterize yet on the road. You do have to re-pump 1/2 way into the shower, but that is life.
I use a bio-degradable soap. I realize this practice is not accepted by many. My thoughts are I and we have just added 21 pounds of CO2 to everybodys atmosphere, for EACH gallon of gasoline we used to get somewhere, so where is the purity?