Bruce Lee was a very moving person, I believe he was in touch with his water. I can't remember exactly where I heard this, but I remember someone positing that the water outside of us, in rain, snow, rivers and lakes holds memory and energy. And that same water, within us, responds likewise to our memory and energy. Or maybe that's what I took away from it, I can't recall.
Either way, I agree that we are naturally like water already by our natural inclinations. In our youth, we flow down the paths of least resistance: loving our parents, loving to play, especially with friends, who we also tend to love. But as we develop into this society, we start to go against our natural inclination, or flow.