Material: mold, mineral water (or cold water)
1. Take a special ice cube mold, wash it and dry it.
2, prepare a glass of mineral water or cold water.
3. Pour the water into the ice box of the mold. Be careful not to pour it too full. Cover the mold and put it into the freezer.
4, after four hours, remove, knock the back of the ice tray to take out the ice.
5, if the ice box is hard to take out, flush the front of the ice box with cold water and repeat step four.