1 tsp Citric Acid
A big glass of ice water
2-3 Tbsp of simple syrup*
Stir the citric acid and simple syrup together with the ice water until the citric acid dissolves. Taste. Stir in more citric acid if you want it a little more sour in your drink, and stir in a little more syrup if it’s not sweet enough.
We aren’t kidding about this being fast!
*(simple syrup = 1 part water + 1 part sugar, boiled together, till sugar dissolves)