The indigenous Tongan people of the South Pacific have a very special ritual called the faikava. This ritual is used mostly for courtship but also as a social gathering. If a Tongan man is looking for a woman who is unmarried and has finished school, he will request to have a faikava ceremony for him and his friends. She may not be a cousin or relative of anyone at the ceremony. A designated person will mash up the kava plant with stones and put the powder into a sack. The tou’a, who is the woman that is being courted, will then pour water into the ground kava root and knead the sack until the mixture changes colors. She shows the colored mixture to the male and his friends for approval, as they are able to tell the strength of the drink by the color. She will then pour the kava into cups for the man and each of his friends. She repeats the process until all men have drunk enough. This process could last anywhere from six to ten hours. The woman is never allowed to take a drink. The kava drink is a well-known drink for the people of Tonga and it is often served in nightclubs around the island as well.
I would put a bottle of the kava drink in the time capsule.