I think remember reading that bottled water standards aren't that great. It's better to drink distilled water, however, I read something about distilled water not being the best either (since it is void of minerals that naturally occur in water) but distilled i think is better than bottled. I mean, how long has the bottled water been sitting on the shelves? Yes, the plastic can seep into the water... I remember as a child I bought a bottled water and thought "hey, this really tastes like plastic..." I guess...it was.
The BEST source of water is that naturally occuring in veggies and fruits. Make lotsa low-sugar veggie juices. I juice cucumbers and that is loaded with natural water.