How to Make It
Stir together water and sugar in a saucepan over high until sugar dissolves, about 2 minutes. Add basil; let come to a simmer. Reduce heat to medium; simmer, stirring often, 3 minutes.
Pour mixture through a fine mesh strainer into a small heatproof bowl; discard solids. Let cool to room temperature, about 20 minutes. Refrigerate, covered, until ready to use or up to 2 weeks. To use, stir into iced teas, cocktails, or other beverages.