But the point is as soon as you let go of the bottle the force you were applying on it stops, no force is acting so what would make the water leak out of the bottle?
That’s the million $ question. What force acts on the bottle while you were holding that does not act on it when you you let go?
The only thing that comes to my mind is water pressure. The real reason the water stops flowing when there is no gravity is because without gravity, there is no water pressure. So I suppose you could say that without acceleration there is no water pressure. But that’s just another way of saying the EP applies and raises a whole bunch of other questions in the process. Not necessarily saying there aren’t answers to those questions, but its just another example of how every answer raises another question and every solution causes another problem when one tries to understand UA.
So if we go with the water pressure answer, we have to ask what caused the water pressure in the bottle when you were holding it? On RE water pressure is created because of water’s natural motion to “go down” aka “seek it’s own level”...because of gravity. Without gravity, with UA, is water’s natural motion up? That would solve the problem of what causes the water pressure in the bottle why you are holding it...but raises new questions about how we observe the behavior of water in any other situation.
If water’s natural motion is up, it doesn’t “seek its own level” and there goes an argument for the flat earth.
See what I mean? It’s just one big rabbit hole. Fers want to waive the EP flag like a magic wand and pretend that it solves all the problems with UA, but that is far from the case.