Based on http://www.thelittleepicurean.com/2015/03/sparkling-blueberry-lemonade.html
Create base (good for 2 cocktails).
3 oz Blueberry juice (Knudsen Just Juice is ideal)
3 oz Meyer Lemon juice
1 3/4 to 2 tsp agave nectar
Vodka (Hangar 1 Buddha's Hand is ideal)
King Ice Cube
Create mix from Blueberry juice, lemon juice and agave nectar (serves 2-3). Sweeten to taste (should be on the sweet side) with agave nectar.
Put 1 - 2 oz of mix in bottom of a pint glass.
Add 1 - 2 oz of liquor.
Add King Ice cube.
Add sparkling water to fill glass.
For a pretty drink, don't stir, and let your guest do so. For a uniform drink, stir.