see the article http://www.stuff.co.nz/business/78652406/the-bottledwater-giants-who-are-taking-our-water
Not only is the amount of water in the bottle used for drinking but it takes any where from 3 to 5 times that amount to actually produce the bottle itself.Also the quality of bottled water is not necessarily any better than tap water.And some still have BPA in the plastic.
If you bought 2 bottles of water a week for 5 years that would be 500 plastic bottles that are either recycled or dumped.
That is one reason it is beneficial to have a dedicated water filter to save on this waste.
By having a quality filter that uses multistage filtering you have got rid of most impurities and chemicals.
But that is only half the story! Then the ideal is to add healthy minerals back into the water so it is close to the way that the cleanest water is in nature when it flows over rocks.This is then good for your health and body and coupled with a good diet you will feel the benefits.