Now that I am older, I switched to one long hot bath a week + one or two spray bottle showers in between. This way we only need to turn on the water heater once a week on bath with hair wash day.
My bottle shower is half boiling water from teapot + half cold tap water in a large soda bottle with a pressurized pump sprayer on top. Set nozzle to mist an it's all I need to take a long, normal time full body shower which I take standing in our normal shower. I also use another sprayer on a smaller bottle for my composting toilet bidet to avoid having to use toilet paper for no. 1's
I use a bidet (the kind that hooks on your toilet seat) so that keeps me feeling pretty clean. My deodorant (a few drops of milk of magnesia + essential oils) works SO well it's hard to tell when I need a shower - but I should really research if it's safe for daily use.
When I am somewhere without facilities, I already have my off grid routine in place, so I never feel like I am roughing it.
Thanks for the tip on covering hair, I will be doing this more from now on when I am working - reminds me of my grandmother, she always did this.
I want to upgrade to a large stainless steel bottle. Anyone know of a large (2+ liter) bottle that has the same threads as a regular soda bottle?