I understandably receive an ongoing number of questions regarding my recommendation to drink bottled spring water. This typically is in regards to the cost. And, i am not a water expert, only an expert on IC.
The difference between Tap or filtered tap in outrageously obvious clinically. There are so many issues that revolve around water and many still far beyond my own understanding. Much more research needs to be conducted in this area.
This article interestingly illustrates even more issues than the ones i bring up. Please read it!
http://www.nytimes.com/2009/09/13/us/13water.html?_r=1&hp