I'm planning to run water supply lines(hot/cold) from the main house to a pool house. The total distance is about 100'. At this point, my plan is to tap into the 3/4" copper in the main house and run 3/4" CPVC to supply the outdoor sink and shower at the pool house. Also considering buried PEX.
For grey water sink drain, I'm hoping that I can install a simple dry well and not drain all the way back to the house septic tank.