Yes, it is true. There is very little point in using these unless you live in an area where drinking water is contaminated with sewage/agricultural run-off (West Bank, Palestine), high arsenic (areas of India and Bangladesh) or nitrate concentrations (any of the above places, and possibly agricltural areas in the US.). Bisphenol A, a major ingredient in many plastics is an endocrine disruptor. The health effects of Bisphenol A are still under investigation. How much is safe is not known. Biological systems effected are not well understood. How much is coming off the water bottle and into the water it contains is unknown.
On environmental impact level, plastic water bottles just use petroleum and create mountains of waste. Yes, they can be recycled, but recycling is not cost free. Someone pays for it (whether through taxes, higher costs, or energy consumption and more pollution).
Carry a glass bottle, carry a cup, use a drinking fountain.
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