What's the difference between seltzer, sparkling water, club soda and tonic water?

They’re all fizzy, refreshing and fun to drink, but is there any real difference between sparkling water, seltzer, club soda and tonic water?

The good news is carbonic acid is a weak acid, so a sparkling water, like Perrier or San Pellegrino, has a pH of about 5.5 compared to bottled still water, which has a neutral pH of 7. The issue really comes in when carbonated water is flavored with citric or other acids, making them more acidic and more harmful to your teeth.

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