Oi Ocha (oh-ee oh-cha) is Japan's No. 1 green tea brand and means Tea, please!. Enjoy this bottled green tea produced by Ito En, Japan's foremost tea purveyor. Brewed from premium whole tea leaves, not tea concentrate or powders. No added colors or flavors. Non GMO Project verified. 0 calories. Natural tea leaf sediment may be present. Product of Taiwan.