Enthusiast III
I love this idea.
I know you are looking for a square set up but now I wonder could it be possible to refit an out of date LPG Tank into a fresh water tank? That is 4Gal/17L give or take of onboard water and if it could be pressurized it would make for a very convenient water source assuming you could clean it out.
check out this site
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12 Inch Wide 10 Gallon Plastic Vertical Liquid Storage Tank
10 Gallon Plastic Water Storage Tankwww.tank-depot.com

Explorer I
23711
Enthusiast III
That seems to be the avenue the DIY'ers go and it doesn't seem to be an issue. You have to spray an inert gas into the tank to cut the valve off, clean it out, and put a useful valve or spigot on it. I'm sure I could do that but I'd like to see if there are other options.
I think you're gonna have a hard time with that one. You might be better of looking for jerry can storage solutions, and mounting jerries there, and using a single propane mount.