Rs KOSO Next Kombucha"Koso" is a fermented drink using traditional Japanese methods. Rs KOSO is made from over 100 different fruits, vegetables, plants, rich in probiotics, probiotics, and enzymes. Suggested Use: Serving size 2 tablespoons (30ml 1oz). Mix 2 tablespoons of R's KOSO with 1 2 cup water or sparkling water. Size: 474ml 16oz. Love letter from R's KOSO In 2018, I moved to NY from Tokyo with my family to chase my dream. In a really short time, my lifestyle and