Coin operated showers.
Just take your soap and shampoo down to the hotel pool. Explain you are saving the planet.
Nothing new!
We did the Alaskan Highway trip with camping. Coin operated showers in some of the towns, was a standard event for us.
What I did not care for was the women getting half again the shower time; for the same cost!
I could see charging by weight. The big ones have more to clean, by sex; no way! My son and I were discriminated against!
And don't get me started on the CST scam!