Other than water, of course, we're talking about manufactured drinks. Tea plants are native to East and South Asia. According to The Story of Tea, tea drinking began in modern day Yunnan province during the Shang Dynasty as a medical drink. From there, the drink spread to Sichuan, where the tea evolved from a medicine to a comforting beverage.
Since then, tea has spread across the world. In 2003, the world tea production was 3.21 million tons annually. In 2010, tea production reached over 4.52 million tons. The largest producers of tea are India, Kenya, Sri Lanka, and of course, the United Republic of China.