Bottled water's advantage (or lack thereof) depends on the facility the water is being bottled at.

Yup, Dasani and Aquafina are tap water.......that have been put through a Reverse osmosis system to remove any chemical impurities, ozonated to kill any critters in the water, then bottled. Saying that it is nothing more than tap water is shading the truth, at best.

Spring water? It all depends on the source and the standards that the plant uses. The plant I worked for had a certified source, and the water was filtered then ozonated prior to bottling, and bottled on a highly controlled line.

Would I trade the well water at my house for either? No, but when we were living in Massachusetts and using a municipal supply, there was a water cooler in the house.