Add honey and water to a pot and boil until the honey has completely dissolved. Remove from heat and drop in the basil, allowing it to steep for 5 minutes. Remove basil from mixture when cooled, and pour into a blender. Add the lime juice and watermelon, then puree. Strain through a fine mesh strainer, then refrigerate. .

When it’s time to serve, add 1/3 c. of syrup to each glass and top with sparkling water. Garnish with basil springs, and enjoy!

When you’re ready to make your soda, pull out your favorite glasses (I'm digging these this summer), add some ice cubes, and pour in the syrup till it’s at about the 1/3-high mark of each glass.