My plumbing system starts in the rear of the van where I have the fill valve. This fills the 16 gallon water tank that supplies freshwater throughout the van via an electric water pump.
Switch that controls the water pump so I can turn if off when not needed or in an emergency.
Directly behind the freshwater container, the PEX pipe connects to the shower handle and supplies cold water to my shower. For now, the hot water is capped off and will be used once I install a hot water heater.
The PEX pipe also connects to my kitchen sink where I also have the hot water side capped off for now.
My simple water system drains into a 5 gallon gray tank that I can easily remove using the quick disconnect to empty.