Should your fresh water tank develop a leak from a crack, being hit by whatever on the road, etc. it does NOT have to be replaced at a cost of several hundred dollars as most camper service centers claim.
The fresh water tanks are made of polyethylene plastic ~ the same plastic used to make milk jugs, plastic gas cans, plastic pails and even glue containers as nothing sticks to the polyethylene plastic ~ and neither will most regular glue products.
Heating the polyethylene plastic with a 'plastic welder' as one would weld metal is recommended. These 'plastic welders' are NOT available at your local hardware/home/farm store.
I've found some sources for product/process allowing quick and easy homeowner repairs without investing in a new fresh water tank.
This is a public service announcement.