In the end, the difference is simple but profound. Seltzer is water that decided to get bubbly. Tonic water is a bitter-sweet soda with a global history and a strong personality.
Next time you’re at a bar or the grocery store, you’ll know exactly what to grab. And maybe you’ll even impress your friends with a fun fact about quinine and the British Empire. You’re welcome.
Now go forth, fizz responsibly, and drink the right bubbles for your mood.