01 - Place grapes, water, sugar, and lime juice in a blender.
02 - Blend on high until smooth and frothy.
03 - Strain the mixture through a fine mesh sieve or cheesecloth into a pitcher to remove solids.
04 - Taste and adjust sweetness if needed.
05 - Chill in the refrigerator or serve immediately over ice.
06 - Garnish with mint or extra grapes as desired.