The shape of water is determined by its container or the forces acting upon it. Water on its own does not have a fixed shape, as it can take the form of a liquid, solid (ice), or gas (water vapor), depending on its temperature and pressure. However, if you're referring to the surface tension of water, it tends to form a rounded shape when in a small quantity due to its cohesive forces. Additionally, water takes the shape of the container it is in, conforming to its surroundings.
