In 2-quart pitcher, stir together all ingredients.
Chill or pour over ice to serve. Add lemon slices if desired.
Use the sweetener conversion chart to substitute any preferred sweetener for the monk fruit drops. (1 teaspoon monk fruit drops is equivalent to about ⅔ cup sugar)If not using lemon flavored sweetener, add in ½ to 1 teaspoon lemon extract to enhance the lemon flavor.Add fruits like watermelon balls, kiwi slices, or sliced strawberries.Spike it with a splash of vodka to turn it into an adults-only keto drink.