01 - Combine grapes, water, sugar, and lime juice in a blender. Process on high speed until completely smooth and frothy.
02 - Pour blended mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing gently to extract liquid and remove pulp solids.
03 - Taste the aguas frescas and add additional sugar or lime juice as desired to achieve preferred sweetness and tartness balance.
04 - Refrigerate until cold or pour immediately over ice cubes in glasses. Garnish with fresh mint sprigs or additional whole grapes if desired.