Plastic bottles can be used to make a simple orange juice squeezer and a simple balloon pump. The steps are as follows:

1. Simple orange juice squeezer

1. Take Get out Coke bottles, one big and one small.

2. Cut the big one in half.

3. Then put the big bottle upside down in the water glass, the small bottle upside down in the big bottle, fix the bottles with bamboo sticks, and the simple orange juice squeezer is completed.

4. Finally, take the oranges cut in half and turn them upside down to make orange juice.

2. Simple balloon pump

1. Punch a hole in the bottle, as shown in the picture.

2. Pierce a hole in the bottle cap, as shown in the picture.

3. Then cut off a small piece of the balloon.

4. Then stick the cut piece of balloon to the bottle cap, and the simple balloon pump is completed.

5. Put the balloon on the mouth of the bottle and press the bottle to inflate the balloon.