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Most drink bottles are made of PET (Polyethylene terephthalate) that is supposedly non-leaching, but it does leave a plastic taste in the water that I can taste to the point to where if the bottle has been left out in the hot sun for a few hours the, plasticy taste makes it practically undrinkable to me. Its probably one of those things that you don't notice if you are exposed to it every day, but I only very rarely drink out of plastic containers (once a year at most) so the taste is very obvious to me. I figure that if I can taste it, there is something being leached into the water.
Polycarbonate contains bisphenol-a which can start leaching out of the plastic as the plastic ages or gets dishwashered often. This has been brought up as a problem with polycarbonate baby bottles.
The easiest way to avoid the breakability problem with glass bottles is to encase it with a foam cover, which also insulates the container so it stays cold longer.
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