Combine the lime juice and Grape Simple Syrup in a highball or wine glass. Top off with some ginger ale or sparking water. Add ice, then stir and serve immediately.
Grape Simple Syrup:
Combine the jelly and 1/2 cup water in a medium saucepot. Bring to a simmer over medium-low heat and stir until the jelly is dissolved. Let simmer until syrupy, 3 to 4 minutes. Remove from the heat and cool completely.
You can use lemon-lime soda or your favorite flavored carbonated water in place of the ginger ale.