SpringStarts under the ground and flows naturally to the surface. Must be collected at the spring or via a borehole that taps the underground rock formation that creates the source of the spring.
Reverse OsmosisA method where water is pressurized through a membrane filter, leaving impurities behind.
DistilledA method where impurities are left behind as the water gets turned into steam, which is then condensed into pure water.
SparklingFizzy water that contains the same amount of carbon dioxide it had when it emerged from its source. Sometimes it can be treated in a way that removes the CO², which is equally put back in. Not to be confused with the soft drinks seltzer, soda water or tonic water.
MineralMust come from an underground source and naturally contain at least 250 parts per million of minerals in the water--none may be added after the fact, accourding to the U.S. Food and Drug Administration.
TapPotable from most faucets in America, it can contain mineral additives like fluoride, which your dentist appreciates but you may not.
Excerpt from Natural Foods Merchandiser, April 2010