Treating your water in a tiny house or an RV has different challenges than in a sticks and bricks house. The good news is that you can treat your water on a small scale using the same methods as household water treatment. It's not hard, it's doesn't require a huge up-front investment, and the long-term cost of treating your water is almost always lower than not treating it at all.
Outdoor showers are not just for showering. Why you need one, and the easiest way to install one.