63 gallon bladder on Amazon, other sizes available as well, $128.00
This could go in the bed of my F-150.
Might consider an insulated box built to hold it, use a water tank heating pad in cold weather, in warmer weather the heating pad might warm the water enough to shower with.
Need to see if it's safe for drinking water, I suspect it would be.
Thing I like about this is that it is portable, as water is used the unused bladder can be rolled or folded up for additional storage space. You could just fill it with less water depending on your needs.
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