Here’s an article that explains some of the mysteries for building an RV-style plumbing setup for a tiny house.
“Currently the majority of tiny homes are built to accept pressurized water hookup from a hose. Simple, but also quite limiting if the house is ever moved for a few days (or longer) to somewhere where there is no pressurized water hookup- a music festival, or, say, a vacant alley lot.”
Read how they are building an RV-style set-up at Boneyard Studios.