As long as we hold on to the bottle, water flows out of the bottle because of the gravitational force . What do you think, why does no water flow out while the bottle is falling down?

During the free fall no water flows out of the bottle, because...

a) ... the air which rushes around the bottle prevents the water from flowing out

b) ... the water does not have enough time to flow out because the bottle falls down too quickly

c) ... water (and bottle) "feel" weightless while falling down

d) ... water freezes into ice in free fall