Pick a fountain in your community and photograph it for a week. Go at different times of the day and use different f-stops and exposures times. You may “freeze” the water or not. You may under-or overexpose as well. You may photograph the entire fountain or just part of it. The main issue is to see you any change in your camera effect your image. One more thing, avoid the automatic on your camera except aperture priority setting. As always, enjoy your photographs.
I picked the fountain at downtown Merced. I shot this image with my 28mm Minolta MD lens that I connected to my digital body. This lens is about 30 years old and produces excellent images.