Ozone in water   the main ...

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Ozone in water

 
the main role of Ozone is that it burns up the bacteria and only stays in the water for a few hours.so it purifies the bottled water. People choose bottled water for a variety of reasons including aesthetics (for example, taste), health concerns, or as a substitute for other beverages.

What I consider before buying a water bottle is, I Look for water in high grade containers, glass is most preferable.Most bottled waters have no expiration date, and while it is unlikely that substantial amounts of microbial growth would occur after 1 year of  bottling of water. this makes me always worry :(.
Keep in mind that you don't know where that bottle has been or how it was handled since leaving the bottling plant. Surface contamination is certainly a possibility.  This means, wash the bottle off under a running facet before drinking it.

Read some information from  Centers for disease control and prevention website http://www.cdc.gov/healthywater/drinking/bottled/