Here is what you need:
One 12-ounce can thawed frozen pink lemonade concentrate
1/2 cup water
18 torn basil leaves - divided
If you want to make it an adult drink, add some vodka!
Place 12 torn basil leaves in medium skillet.
Add thawed frozen pink lemonade concentrate, 1/2 cup water. Cook over medium-high heat until syrupy, about 10 minutes.
Stir in 6 more torn basil leaves; let cool, then strain.
Then for each drink, combine 2 to 4 tablespoons flavored syrup with 1 cup cold seltzer in an ice-filled glass. (For adults you can add a shot of vodka!)