Honestly, I have never drank it for the taste, so that part does not concern me much.

[ he needs to stay awake because he sleeps like shit, duh. the tea he drinks in new amsterdam is the most caffeinated he can possibly find. not now though - it might be english breakfast but of course he has two versions, and this one is decaf. ]

Though mushrooms in tea sounds a particular kind of unappealing.