Roughly sixty percent of you is water. Your blood runs close to the salt of an old sea; each of your cells is a droplet that learned to hold a shape. Before it was ever "you," this water was rain, river, cloud, glacier, and the warm inside of other creatures.
Astrida Neimanis puts it plainly: we are, each of us, a body of water — not a sealed vessel with water stored inside, but water itself, gathered for a while into the shape we answer to.
And it doesn't stop at your skin. You drink the sky and breathe out the sea; you pass your water on. You are less a thing than a place — somewhere the planet's water is briefly passing through.