This is just one method for using Water for scrying.

Take a clear glass and fill with clean water. Set it on a dresser in front of a mirror, on top of your Book of Shadows. Then take a lit kerosene lamp and put it between the water and the mirror. Make the glass of water high enough so that the flame can be seen through the water. Sit with your back to the water, and with a hand mirror, look over your left shoulder at the reflection of the glass of water. Be silent and still for a few minutes and you will start to see images in the glass in the reflection.