Also the La Croix Grapefruit sparkling water may be even better!
The miracle fruit really activates the sourness of the the natural grapefruit flavoring.
i discovered this combination on accident after munching a miracle fruit in my yard... and then over an hour later grabbing a can on the way out the door on the way to an event. I drank some at a traffic light and thought "wow! that tastes like cola, not seltzer!" - then connected the dots.