Not exactly, but.....
We picked up a couple of solar showers last year, that work great. Heat them in the sun a few hours, and they are comfortably warm.
Could drain them into a tank, maybe, or hang them in your shower to use.
Or, use them to wash heads, as we did, outside and well away from the campsite.
🏡 🚐 Cherish and appreciate those you love. This moment could be your last.🌹🐚❤️