Pour water into a plastic bottle and close the lid, try to squeeze water in it, then pour

Pour water into a plastic bottle and close the lid, try to squeeze water in it, then pour out the water, close the bottle again, now try to compress the air, explain the results of the experiment.

It is not possible to squeeze a plastic bottle filled with water and closed with a lid. You can squeeze a bottle in which the air is closed.
Experience shows that water is practically uncompressible. The characteristic distance between its liquid molecules is such that the forces of attraction are almost equal to the repulsive force. When you try to compact the molecules and reduce the distance between them, the repulsive forces sharply increase.

Gas lends itself to compression because the average distance between air molecules is large compared to their size. Molecules can move freely, interacting only when they collide with each other. With increasing pressure, the concentration of molecules and the frequency of collisions increase.