In a medium saucepan, stir together the sugar and water.Bring to a boil, stir until sugar is dissolved while boiling for about 1 minute.Remove pan from heat and stir in flavored drink mix or extract. If using extract start with ½ teaspoon then add more to taste if needed.Allow to cool completely and transfer to container for pouring. Syrup will get thicker as it cools.Prepare shaved ice and pour on top.