Overland Hadley
on a journey
You might want to check these guys out for water filters. http://generalecology.com/
Thanks for the link to the water filters, those are impressive and expensive filters.
But my main intent is to remove the built in tank, rebuild the kitchen counter/cabinetry and have the sink faucet pipe into a 5 gallon jerry can style water container that I can then move where I want it more easily. As well as just drag it into a Whole Foods and fill it up without a hose.
That is what I plan on doing, having a 20l jerry can as my water tank. That way I can carry it into a visitor center (etc) to fill with water. I also have the 40l footwell tank inside the cab of the truck, but that can be filled with a couple trips with the jerry can.