It was a rainy day so I spent some time surfing for gray water evaporation methods. This is the best one I could find.
They evaporated 30 gallons per day.
I believe the round design with the kiddie pool is too bulky to carry. I’ve got a preliminary design for a linear model which could be rolled up or laid flat for shipping. It could be powered by a dedicated solar panel or the camp windmill or it’s own smaller windmill. It only needs about 40W. It was also suggested to use chlorine pellets like pools use, to disinfect the gray water.
Alison adds: Here’s a video of a similar design.