You need: Water, belief, and working vocal cords
Original (from @L0V3ILY):
Water, my friend, my partner, my world, the only thing I ask from you is a little control.
If you try to control it from your sink, make sure it's not all jumpy before you start. With doing this spell, you can see if it really works if it has a natural flow. You will be the one to make it move.
Water, my friend, my partner, my world, work with me in harmony. All I ask for is a little control.
Make sure the water is placid. If it works, you will move the water. I don't know if you have to say it every time or just the once. I'll try it out and let you know.