How do I buy a drink for everyone?

To serve a drink, enter the lounge by clicking on the green armchair icon. Then select the tea set icon at the bottom to enter the cafe. Tap on the teacup icon with a "+" : sign in the bottom right corner to pull up the menu. Click on the coffee cup to see how much it will cost. First cup every 23 hours is free; after that it will cost diamonds. Click again to accept the cost and serve. You'll receive the coffee energy and tips associated with your drink and your cup will appear on the tray. If you are on a team, your teammates will receive your drink. If you are not on a team, your drink will be served to those players on your boat list who are not on a team either.