Rest your wrist to give it time to heal. You may find that, depending on the severity of the sprain, immobilization through a soft cast is necessary. If your sprain is the result of a sports injury, you should stop playing the sport immediately, at least for a few weeks while your wrist heals.
Water also has a high level of surface tension. This means that the molecules on the surface of the water are not surrounded by similar molecules on all sides, so they're being pulled only by cohesion from other molecules deep inside. These molecules cohere to each other strongly but adhere to the other medium weakly.
In fact, other than mercury, water has the greatest surface tension of any liquid. (Source: Lakes of Missouri) Within a body of a liquid, a molecule will not experience a net force because the forces by the neighboring molecules all cancel out (diagram).