In my opinion tea is the most underrated hacker drink, at least in Germany. In all companies everybody drinks coffee all day long. If u drink tea, you are an alien. Especially if u prefer loose leaf tea over the the dust in bags from the supermarket, you are a little weird.
I hoped the big Club Mate hype could bring some people into the tea camp, but omg even the most of the few people who drink tea doesn't know why chamomile tea isn't actually a tea...