It's child's play.

We live where there is no municipal water or sewage. We have two holding tanks, one for water, one for waste. We haul the fresh water ourselves, but there are contractors we could hire. We call a pumper truck to empty the waste water tank occasionally and they haul it to a municipal dump site where it gets treated along with the rest of the municipal sewage.

There are RVs all over the place with appropriate toilet and water systems.

In the early 1980s, I worked at remote work camps with wash shacks that had hot and cold running water with flush toilets.

It's a solved problem.