1. The following materials and tools need to be prepared to make the pigeon automatic drinking machine: a water tray and two plastic bottles.

2. Next, cut off the bottle mouth of the plastic bottle, as shown below.

3. Then smooth the bottle mouth cut from the plastic bottle.

4. The effect after polishing is shown in the following figure.

5. Next, apply glue to one side of the plastic bottle mouth.

6. Next, you need to stick the above two bottles on the upper and lower parts of the plastic bottle, as shown in the figure below.

7. Then use wallpaper knife to open the bottle corresponding to the plastic bottle mouth.

8. Then fill the plastic bottle with clean water.

9. The last pigeon automatic drinking machine is ready, as shown in the figure below.