Tips:
1. You can put any liquid in a cup, preferably not mixing multiple liquids together. The optimal ratio of liquid to water is 1:3-1:5, adding small amounts multiple times.
2. After each use, clean it in a timely manner to prevent the pump head from being blocked and bacteria from growing in the bottle, which may affect the next use.
3. When the bottle is empty, the pump head rebounds, possibly because there is foam accumulated in the pump head. If there is liquid, it may be that the straw is too long, so trim it appropriately.