Step 1

The first thing you're going to do is make a simple syrup. In a small saucepan over medium heat, combine the sugar and water.  Stirring occasionally, heat the mixture until the sugar is completely dissolved.

Step 2

Remove from the heat and allow it to cool completely. Once cooled, pour the simple syrup into the container in which you'll be storing the sour mix.

Step 3

Add the lemon and lime juices to the simple syrup. Give everything a shake until well combined. Seal the container and store the sour mix in the fridge.