Tap water that has been left to sit out slowly begins to acquire an off taste. Many assume that this is because of microorganisms. Treated water’s added chlorine will take care of small communities of these little guys, but at room temperature they begin to multiply rapidly and can really get the party started. Even with clean water and a clean glass; one sip introduces a host of germs to the mix, in addition to whatever the water may have picked up by ambient dust.
Many Americans choose to drink bottled water over tap water because they believe that tap water may be “dirty” or more harmful to them. However, recent experiments conducted to test the purity of bottled waters have found that this may be a misguided belief