Instructions
Access your camera's shooting menu and set your ISO according to the lighting conditions. If you are shooting outside on a sunny day, an ISO of 100 or 200 will suffice. If you are in deep shade or shooting at night, increase your ISO to 400 or 800. As a general rule: the dimmer the lighting, the higher the ISO.
Set your camera to shutter-priority mode (indicated by an "S" on selector dials or "Tv" on LCD screen menus). This allows you to choose the shutter speed while the camera automatically selects an aperture (size of lens opening) that will result in a properly exposed photo.
Change the camera's shutter speed to 1/1000th of a second or greater, as this will freeze both the moving and the splashing water that surrounds it. If your chosen ISO does not allow for 1/1000s, increase it. The higher your ISO is, the faster your maximum shutter speed will be.
Point your camera at the subject and compose the image in the viewfinder.
Hold the camera steady and press the shutter button gently to take the photograph.