And which one is better for you?
Coinman’s dead on target. Couple other small points:
Think quinine tonic was Rawther Popular as a mixer in the malaria belt (think India,etc.) in the 1800s. Since quinine is extremely bitter-tasting (the old medicinal-dose stuff must have been awful!), sugar had to be added. Modern tonic has sugar/corn syrup or is available in diet versions—your judgment on "how healthy" THAT is. But don’t count on being able to get a therapeutic dose of meds on modern Canada Dry tonic….
Soda water (just carbonated water, SOMETIMES with flavoring but no sweetenings) has no calories by itself. Pretty popular with folks who want bubbly soda with pizza, but who hate diet beverages. Look for lemon-lime(very, very common), lime, lemon, raspberry, or orange flavors. I’ve seen black cherry s.w. in the midwest USA, and a wonderful cranberry-lime s.w. in Rhode Island.
Mineral waters, were really trendy in the 1970s and 1980s, minimally tasty, and seem grossly overpriced at ALL times, IMHO. It’s the minerals that provide the distinctive tastes of each…..and those vary from "subtle" to "what DIED in the water supply, anyway?" Used to be "health-giving" in the 1800s and early 1900s—people went to "the springs" to bathe AND drink the stuff….sulfur compounds and all…..