Have you ever heard the story, the prophet Moses who travel around the desert with his followers who numbered about 2 million followers, they traveled for 40 years to reach the land of Canaanites. In the story of the journey they found a spring of water, but water is not able to drink because it tastes very bitter, and then draw the Prophet Moses and put the tree in the spring, then the water became sweet and drinkable. Now that spring is still there, is now used in the form as well (unbelievers or not!). 
