Citrus soda syrup

  • 20mL agave nectar
  • 20mL of lemon or lime juice (or a combination of them, totaling 20mL)

Combine the above, and then add to 1 liter of sparkling water.

For an extra kick, add some powdered ginger, or replace some (or all) of the agave nectar with ginger syrup. And maybe a pinch or three of cayenne pepper.