Blueberry puree for drinks is made with fresh blueberries, sugar, and water.  Blend the ingredients in a blender until smooth. For extra smooth blueberry lemonade, strain the blended puree into a fine mesh strainer to remove any small blueberry pieces left from blending.  Blueberry puree can be kept in the refrigerator for up to 5 days, so make ahead and enjoy blueberry drinks anytime!