Measure out and add one-quarter teaspoon (tsp.) of citric acid to three of your cups. Leave the other two cups empty. To one of the cups holding citric acid add one-sixteenth tsp. baking soda.
You can order the acid powders online; citric acid is widely available at health food stores. Makrut lime leaves are sold at Indian markets. We used Tanqueray Rangpur lime gin, but any citrus-forward ...
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