Itoen Oi Ocha Tea, 2 Liter — 6 per case. Now enjoy the classic taste of Oi Ocha in a convenient 2L size bottle. The most popular green tea beverage in Japan, Oi Ocha is brewed from prime first flush green tea leaves, meaning the best quality leaves picked right in the spring. Brisk and refreshing, Oi Ocha offers an authentic Japanese taste, the result of our patented Natural Clear production method, which yields superb clarity and a natural green tea taste. Unsweetened. No calories. With more than 100 Percent RDA of Vitamin C.