someone swings a bucket of water in a vertical circle. Describe the water's motion to another person? or How would you? & also how to explain the motion of the water to them? How come the water didn't fall on the persons head?

A: Centrifugal force causes the water to not fall .. but why. Is there a depth explanation to this question. Seems simple but is complex in its answer. Can't figure it out

Think about when you go around a curve in a car. Your body pushes against the door. There isn't some force out there physically pushing you against the door. You feel it because the car is turning and Newton's first wants you to continue on in a straight line. But the car gets in the way and takes you along too. Same for the water in the bucket.