to close the water inlet after the cistern is full
If the bottle is from glass will burst soon; the plastic container will be melted.
Since air is less dense than water, the air pushes the bottle upward. The water filled bottle would sink because the density is greater than water.
"The volume of air in the diver decreases."
It depends on with what you fill the bottle. If the bottle is filled with water, then 0 calories are inside the bottle. As for the bottle itself, I have to recommend not consuming the plastic and getting your calories elsewhere.
The volume of air in the driver decrease.
yes. it's called the bottle-nosed dolphin sea
In the first place the water in the bottle would keep the temperature of the plastic down preventing it from burning and leaking, The same as you would do by boiling water over a flame in a paper cup, However the water in the bottle would heat up and eventually the pressure inside the bottle would burst it like a balloon.
Air
Filled. For example, I filled the bottle.
The water expanded when turned into ice. As there was no air space in the bottle, the plastic failed under the pressure.
Are we talking water that has been bottled and distributed or are we talking about you filling up a bottle yourself? Bottled waters are filled under sanitary conditions. They should be pretty much okay as long as they remain sealed. Water stored in plastic can acquire some plastic taste to them. If they weren't filled under sanitary conditions, bacteria can build up and cause severe health problems.
Water is filled into a bottle by pouring it in through the opening at the top of the bottle. The water flows into the bottle due to gravity, filling the empty space inside the bottle until it reaches the desired level.