If water is bottled under sterile conditions,it's shelf life is forever.If you bottle it with tap water,you should change it every 6 months or so.

The bottles of water at the store are good for at least 2 years in the original bottles,everybody that bottles water is trying to kill off it's customers?If it doesn't leach in that amount of time,why would it leach when I fill it everyday?

If your water bottle taste bad after a few hours of riding in the sun,might try using something different......

If using the bottles the water comes in is bad for me,it better hurry up and do something,I could use a third arm at work......since one of them has a cell phone in it at all times!