As to Spring Water, Dr. Falkinham explained that the term spring water is generic. Any bottled water labelled "spring water" will serve. They have tested grocery-purchased "pure", "distilled", and "spring" waters at local grocery stores and found that microbial numbers were lowest in those labelled "spring water". Further, water labelled "spring water" had the lowest number of MAC and NTM; quite a bit lower than what they found in municipal or household water samples. He advises going to the grocery and picking up a collection of different bottled waters labelled "spring water" and take them home, then do a taste test and find the one you like and use that.