① Pushing the bottom of the mineral water bottle standing upright on the table by hand can make the bottle move forward, while pushing the top of the bottle standing upright on the table with the same force will make the bottle fall forward. This phenomenon shows that the action point of force is different and the action effect of force is different, which shows that the action effect of force is related to the action point of force.

② Drill many holes with small nails, and then fill the bottle with water. Under pressure, water will be ejected from small holes in different directions, indicating that the liquid has pressure in all directions;

③ Inject a small amount of hot water into the empty mineral water bottle, shake it well, and immediately cover the bottle cap. After a while, the water vapor in the bottle liquefies, the volume becomes smaller, and the gas pressure in the bottle becomes smaller. Under the action of external atmospheric pressure, the bottle slowly sinks inward, indicating that there is pressure in the atmosphere;

④ The friction when the bottle rolls is rolling friction, and the friction when sliding is sliding friction. Blowing the side of the bottle hard will make it roll, but blowing the bottom with the same force will make it difficult to slide, which shows that the rolling friction is much smaller than the sliding friction under the same pressure.

Therefore, the answers are: ① the point of action; ② There is pressure in all directions in the liquid; ③ There is pressure in the atmosphere; ④ Rolling friction is much smaller than sliding friction.