Vitamin c drinks. Display query life. Com, Nongfu Spring Granule is a kind of beverage containing vitamin C, which is a functional beverage introduced by Nongfu Spring Company. This drink adopts advanced water-soluble technology, which combines vitamin C with water molecules and is more easily absorbed and utilized by the human body. Nongfu Spring Co., Ltd. is one of the top 20 beverages in China, focusing on the development and promotion of natural water, fruit and vegetable juice drinks, special-purpose drinks and tea drinks.