What You Did
You made a miniature waterspout, which demonstrates the circular motion of air or water in destructive weather phenomena such as tornadoes, waterspouts, dust devils and hurricanes.
If provided with the right forces, the water in your bottle should spin and swirl, pulling down toward the cap.
It can be tricky to get the motion just right in order to create the best effect. You have to move fast but keep the motion circular. You might want to ask someone who is bigger and stronger to help.Adding too much or too little water will effect the results as well.If your cap isn’t on tightly enough, the water will leak out when you turn the bottle upside down.
Try putting small, floating objects, like small building bricks inside the bottle