Water is necessary for the elements of the earth to thrive and grow. Without an adequate water source, life begins to dry up, become parched, and eventually die.
Spiritually the same principle holds true. We need a source to feed us and to nourish us. We need to be well-watered so that we can be healthy and live a life that honors God and loves others. God is our source and where He leads us will always have water. He will fill us and He will never run dry.
Find your nourishment in the Lord. He will lead you and love you, and as you follow Him, you will never run dry.