Squeeze lemon or lime and add 1-2 T of the juice to the glass
Add 2-4 mint leaves (you can tear them or leave them whole)
Add ¼ t salt; the sparkling water will fizz a little!
Serve, optionally with an extra lime or lemon wedge on the rim of the glass. If you’d prefer sweet lemonade, add a tablespoon of maple syrup instead of salt.