High-Level Summary for Plumbing

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One person needs 15-20 gallons of water, we recommend having no less than a 20-gallon fresh water tank.

A water Heater is not a must as most of the camping happens in summer. 3 choices are available: Diesel/Gas heater, Electric Heater, and Propane Instant Heater.

A water pump is a must-have. When the 12v DC-powered water pump detects the water pressure release it starts pumping. 

Unless the van is for full-time living, an outdoor shower or a fordable simple indoor shower should be considered instead of an enclosed indoor shower room. 

A grey water tank could be mounted under the van to save some space. However, an indoor grey water tank might be better if a van is used in freezing weather.

A deeper sink with a lid is always the best choice for a camper van.