Originally Posted by angry
How is this water naturally sparkling?
Ground water that is under pressure can absorb carbon dioxide and become carbonated, or 'naturally sparkling". Almost all commercially produced "naturally" carbonated spring waters have the carbonation removed, and then added back in controlled quantities to ensure product consistency though. I am not aware of any bottled naturally carbonated water that is bottled straight from the source without some sort of processing.
I've drunk from a naturally carbonated spring before with no ill effects, but they do warn you not to, on account of animals drinking from such springs too, and other contamination possibilities.