This is great for any sweetened summer drink! Last week we tried this fabulous Sweet Basil Smoothie. It really sounds strange but it's very good. We have more basil than we can handle right now so this was a nice way to use some of it. The only adjustment we made was less syrup as it gets very sweet. The simple syrup for me personally was too sweet so I made another mix of ingredients and it was more to our liking.
3/4 cup sugar
1 cup water
zest of 2 limes
Heat water and sugar on stove. Put zest of two limes into water mixture. Continue to heat until sugar is completely dissolved. Refridgerate for at least one hour. Mix with your favorite drinks instead of sweetener.