01 - Place grapes, water, sugar, and lime juice in a blender container.
02 - Blend on high speed until completely smooth and frothy, approximately 1-2 minutes.
03 - Pour blended mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing gently to extract liquid and remove solids.
04 - Taste the agua fresca and add additional sugar or lime juice as needed.
05 - Refrigerate until thoroughly chilled or serve immediately over ice in glasses.
06 - Decorate with fresh mint sprigs or additional grapes if desired.