Various water bodies provide great opportunities for taking pictures with reflection. For a perfect mirror reflection photograph of the subject on water, the water surface must be still but without sunlight shining directly on it.
FOR A good shot of water reflection, early morning or evening time or golden hours, is the best time. Moreover, for good water reflection shots we need to have well illuminated subjects against a clear blue sky. Therefore, you must position yourself in such a way that the sun is not be in front of you, rather is should in back of your position.
Also, your camera needs to be tilted to almost a grazing angle. At times the best water reflection shots happen near the shallow area of the water body.
Use a tripod for the camera or a chose a firm rest for it. Set the camera at f/16 or smaller for great depth of field. Expose for the reflection and have a low shutter speed if the water is still.
Use an ND filter if you have one or forget about it. The angle for shooting can be largely a result of your compositional choices with your focus on the reflection rather on water. These tips are helpful but you need to experiment a bit by changing your position and camera angle.
The inset picture of the building has been taken in shallow water accumulated in a play field close to the building during the golden hour.