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"In the US peeps don't drink it because there isn't any good ones available"

The internet has taken care of that. Also, the Canadians have been supplying us with Red Rose for more than a century, which, while not top of the line, is a highly acceptable everyday bag tea.

Also, you can get PG Tips pretty much everywhere.

Edit: To be clear, I'm not holding up RedRose and PG as the pinnacle of teadom - they're just very acceptable and available widely.

it's likely that it's not diarrhea exactly it's just that caffeine (in any form coffee is just the most concentrated that most people drink) promotes/causes peristalsis.

https://en.wikipedia.org/wiki/Caffeine#Side_effects

A Chinese friend of mine brought me what he said was very high quality tea when he went back to China to visit his parents. I like tea, but I honestly couldn't tell the difference between it and the stuff I get at the supermarket.