El Diablo,

+1 on the Wally World containers, that is what I was referencing in my response without getting specific.

I keep a couple bottles in my trunk and after a summer of +100* they taste terrible. The local news did a story on keeping water bottles in your car in the summer and how the heat leaches chemicals from the thin plastic bottles into the water. Also any bacteria or chemicals that may be in the water itself from the source will affect the taste.

I have a pal who has a business that tests medical equipment. Part of his testing process is to use 100% pure H2O. His set up is identical to any other water bottler, except for one thing. He doesn't have a machine that adds minerals back into the water which gives it the 'taste'. If he did such he could actually make money on the side bottling water.