With one liter boiled water a tea (green tea with summer and winter with black tea) plus sugar, 2 2, filtered hot tea after a quarter of an hour, cooled to 30 ℃ into sterile large mouth glass containers. Take a bacterial membrane, immersed in tea, sugar, use three layers of gauze Gaiyan summer immersion week, winter, soak for 20 days. When the broth is clear and transparent and have become rising bubbles when there was a fragrant smell sour, you can drink. If the broth turbid, not drinking. Drink 2-3 times a day, every time a cup after meals to drink.