Bottle Caps are used to unlock Event Buildings, Captain Peter, and Chad. Bottle Caps can be obtained in the following ways:

- Making Quagmire Book Cruise Tickets

- Making Joe Wear a Sailor Hat

- Making Carter Buy a New Yacht

- Making Seamus Enjoy the Open Sea

- Making Survivor Chris Look for Water

- Making Captain Peter Read the Waves

- From Bottle Caps Shrines