36 kilograms. According to the information published on Nongfu Spring official website, Nongfu Spring has 36 kilograms of water in a big barrel. Nongfu Spring's large barrel water capacity The capacity of Nongfu Spring's large barrel water dispenser is 18 liters. Nongfu Spring Co., Ltd. is one of the top 20 beverages in China, focusing on developing and popularizing natural water, fruit and vegetable juice drinks, special purpose drinks and tea drinks.