01 - Place grapes, cold water, sugar, and fresh lime juice into a blender canister.
02 - Blend on high setting until completely smooth and frothy, approximately 45-60 seconds.
03 - Pour blended mixture through a fine mesh sieve or cheesecloth into a pitcher, pressing to extract all liquid while removing solids.
04 - Taste the agua fresca and add additional sugar or lime juice as needed to achieve desired balance.
05 - Refrigerate until thoroughly chilled or serve immediately over ice in glasses.
06 - Finish with fresh mint leaves or additional grapes as a decorative touch if desired.