Top ice with grapefruit juice, followed by coffee.
Add a few drops of vanilla extract to drink.
Fill glass with sparkling water. Stir everything together.
Serve immediately. Enjoy!
Notes
You can make this drink with any kind of plain, unsweetened coffee you'd like, such as cold coffee (from a can or brewed at home), espresso, or cold brew. I like to use this easy-to-find cold brew concentrate.Use your favorite sparkling water, such as club soda, mineral water, soda water, or tonic water. I typically use Topo Chico or club soda.For a sweeter drink, add a little homemade simple syrup or vanilla syrup (skip the vanilla extract if you use flavored syrup).Make sure to check out the info before this recipe card for helpful tips, variations, and related recipes!