Water Tank
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My
van will have no shower so this water tank is way bigger than I really
need. But I thought it was a clever use of space around the wheel well,
so I will just fill it with the water I need.

The tank is anchored securely with wooden blocks and ratchet straps. The plywood bed will be built above this water tank.

This fitting connects to a foot pump, and from there to a galley sink.

The water pump and all these valves allow me to do lots of water things, such as (1) fill water tank from a hose or a bucket, (2) take a shower, (3) drain the tank.