I had some stainless steel water tanks made for a custom camper I had built some years ago. Some things I found out (mostly before I had them made):
Custom SS work costs a lot !
SS is brittle and water is heavy, so needs some thought when designing attachment brackets etc.
Consider future maintenance, things like easy to access and use drain plugs. and maybe an access port to both get to the pump when it needs to be worked on as well as physically clean out the inside of the tank (eg build up of scum, algae etc).
It is better to have two smaller tanks rather than one large one, so when you get a batch of "lesser quality" water you may still have one tank with drinkable water still.
You may want to fill from containers (eg jerry cans, jugs, bottles etc), at other times it will be a lot easier to fill from a garden hose, so allow for both inputs.
Normal garden hoses taint drinking water (it tastes funny after a few days), either black poly pipe or special drinking water hoses are needed).
If you have your own water you can rig up a heat exchanger from your engine to supply hot water for showers, which are sometimes really appreciated.
Hope that helps
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
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