So explain to me, if you can, how the water stays on all sides of the ball without spilling out. It certainly can't be demonstrated experimentally. However, it is fairly simple to demonstrate experimentally how water stays within a bucket. The simplest experimental evidence supports flat Earth theory over ball-Earth theory.
The force of gravity is strong enough to draw the water off the ball. It is not strong enough to draw the water through the bucket. There is no comparable force of gravity drawing the water off the 'ball' of the earth. Put the earth on the surface of Jupiter, and the water will drain off.
Seriously, you need to read a high school physics text.
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