I can definitely taste a difference between tap water and bottled so I go with the tastier bottled water. As far as bottled water, I have not sampled that many but I can usually taste the difference from those I have tried. My favorite is the Refreshe Purified Drinking Water. Label says "Minerals added for taste" and that mineral enhancement must be why it tastes good to me. Tastes better than most of the expensive spring water I have tried. About $3 for 24 bottles at Safeway.