Place the fresh blueberries, water, and sugar in a saucepan over medium high heat.
Bring to a boil and then reduce the heat and simmer for about 10-15 minutes.
Mash the blueberries and then strain the liquid discarding the solids or using in a smoothie/different recipe. (I blended the remaining blueberries up in a smoothie the next day)
If desired, rim the glasses in sugar (I LOVE this simple addition to the flavor of the drink!) Simply press the top of the glass in a bowl of water and then the wetted top of the glass into a small bowl of sugar. Shake off the excess.
Fill up 4 glasses to the top with crushed ice - really pack in the ice!
Fill up the glass with the blueberry syrup. Allow the syrup to "settle" into the ice and then fill up the glass with Mandarine-Lime Sparkling Water.
Stir and add in some freshly squeezed lime.
Taste and adjust the drink to personal preference (adding more syrup, more sparkling water or more lime.)
If desired garnish the glass with fresh mint and add a handful of fresh blueberries into the glass.