I'm a little bit leery of bottled water in general the last few months, since I've noticed all the major brands are switching to these new "eco-friendly" bottles with much thinner, more brittle layers of plastic.
Not only are the new bottles a pain in the ass to open, since twisting the cap at the top ends up actually twisting the entire bottle and even if you do get it open, there's a very good chance the compression required to grip the bottle would result in you spilling precious H2O all over yourself - but it also seems as though the thinner plastic would be much more liable to leech toxins and other nasty components into the water itself.
I like those big ol' translucent jugs you sometimes find on store brand water. They're unwieldy to carry around and not very portable, but they seem much safer to drink from.