For approx. 20 years we have had a home-built system to distribute drinking water around the house.
The water comes from a conventional bottled water dispenser in the kitchen. We drilled a hole in the bottom of the reservoir and ran a tube to a pump. The pump runs as needed, to maintain 20 psi in the lines. The lines run in "milky tubing" from the pump to three places around the house - in the kitchen it goes to a hot water dispenser and the icemaker in the refrigerator, and there is also a run to the master bedroom. I have been using the thickest wall milky tubing available at local stores, but the tubes that are up in the attic last only 5 - 10 years. It does not freeze here, and it never gets very hot either - southern Cal. near the ocean) but obviously the attic heat is affecting the tubing. I know that if I changed the attic tubing to copper, it would last forever, but I would like to avoid having the water go thru copper. Is there a longer-lasting plastic material available, suitable for potable water? Cost would not be a big factor as the attic runs are only about 10 ft. long.
Henry