How do you give coffee to another player?

If you are on a team, you can only share coffee with your teammates, hopefully at a prearranged time so everyone can benefit. If you are not a team, you can share coffee with players on your boat list, but since meeting is not prearranged, you can give when the game shows someone else is online playing. There is no way to tell who is actually online playing. So you cannot give coffee to one player in particular.

The way you give coffee:

-Enter lounge by tapping on the green armchair icon.

-Enter the cafe by tapping on the tea set icon.

-Pull up your menu by tapping on the teacup with "+" sign in the bottom right corner.

-Tap on drink, to see how much it will cost (first one is free, every 23 hours. Each subsequent drink is 10 diamonds more than the last).

-Tap on the cost to share the drink.