There is Alway's the Possibility,The Brand of water you've chosen,was Stored & Filled from equipment using PVC,Plastic,etc.,Providing a Certain Flavor before it even get's into the Final Product!I keep water in my vehicle,24/7 in a Canvas Sack,I have yet to taste the Plastic,& I've been doing this for more than 10 yrs!I have tasted the plastic of a Gatorade bottle that was,Not Properly stored out of the Sun though,It still Quenched my thirst!

Wasn't just one brand, I've tried a lot. There are a couple in sturdier bottles that don't have the plastic taste or like someone said re-using gatorade bottles.