The truck will have two water tanks,
Tank one is 700Lts and will be used for Shower (inside and outside), Sink,
Toilet flushing, Washing Machine
Tank two will be used for drinking water only. Via a filter system.
You can see in the picture below:
Inspection Hatch.
The level sensor (900mm long)
Float switch to control the automated fill valve
Fill Valve
Air Bleed.