Turkey

Black tea is served in small, curved glasses—a lot of them, as locals can consume dozens of cups a day. To avoid odd looks, add sugar only—no milk or cream.

China

Chinese tea drinkers tend to reuse their leaves throughout the day. To fit in, put your tea into a vacuum flask and refill it with hot water as you run low. It is considered rude to pour for yourself before serving others. If you want to be traditional about it, you can gently tap your fingers on the table to say...