Why do you think that many daoist painters featured water in paintings that reprsented daoist beliefs

According to the beliefs of Taoism or Daoism, there is only the "Way" or the Dao in which all living beings must live according to and in harmony with in order to be one with the universe. Being one with the Tao is same as saying that you are one with the "flow" or the flow of the universe. As long as you are in harmony with the "flow", you are living the way you are supposed to be. One of the best representations of flow is water because water flows endlessly. It takes the form of any shape, can stretch, and can also flow endlessly in a stream. Because of this, Taoists believe that water is the best physical representation of the flow in art. 

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