The bottle is you. what's inside is your emotions and reactions. The outside world and people are gonna attack you and rattle/shake you from time to time.
If you shake a bottle of soda, when you finally open up you're gonna explode.
But if you shake a water bottle , once you open up it's same calm water as it was before it got shook.
Don't let other people and this world disrupt your inner peace. People will say many things, ignore them.