The World Health Organization (WHO) published a fact sheet on bottled water back in October 2000... It's sort of old news, but it's one more data point...
...some substances may prove more difficult to manage in bottled than tap water. This is generally because bottled water is stored for longer periods and at higher temperatures than water distributed in piped distribution systems. Control of materials used in containers and closures for bottled waters is, therefore, of special concern...
Full article: http://www.who.int/mediacentre/factsheets/fs256/en/
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