Place water and sugar in a 1-1/2 quart saucepan and bring to a boil over medium high heat. Cook until sugar dissolves. Transfer to a container and refrigerate until completely chilled. Place all ingredients in Cuisinart® SmartPower Premier™ Blender jar and cover. Press ON. Press HIGH and blend for 30 to 35 seconds until completely smooth. Serve immediately in margarita glasses (may be salted or not). Garnish with a slice of fresh citrus.