I haven't had a drink of soda in about 4 months. I really like to have a drink of bottled water from the supermarket - it's called "naturally sparkling water" and it usually has what they call "natural flavours" in lemon-lime or raspberry. How is this water naturally sparkling? Also, when they say "natural flavours" does that mean real lemon/lime and raspberry?
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.