A supply of tea with milk and sugar would be nice. If it is tea I really like, I like it without milk and sugar. With milk and sugar, any kind of tea is fine. I always bring tea bags with me, so if we use my tea bags, I will certainly like that tea without milk or sugar.
Really, I think he's just screwing with us. Douglas Adams would be proud.
You don't even need to buy him tea; he explicitly says he always brings his own with him.
This is fine, as long as I know precisely what kind of tea he likes. But that's not specified, so I just gotta guess what he might like. And then buy some milk and sugar, just in case he likes my fancy tea just enough to drink it, but not enough to skip the milk and sugar.
Really I think he's just writing his opinions on tea off the top of his head.
Worst case scenario is that he doesn't use them, in which case you're out what, two dollars? That is peanuts compared to what some riders cost you by specifying elaborate A/V and lighting setups, specific vendors and contractors (i.e. friends of the speaker) you have to deal with, luxury transportation and lodging, et al.
As to the "what kind of tea" issue, he helpfully solves the problem for you -- he'll bring his own, which he is guaranteed to like. So there's no scenario where your failure to choose the right tea will result in him being tealess. Strictly speaking the only thing you're on the hook to provide is hot water, which is free and easy to scrounge up at short notice.
It's really a remarkably stress-free document, as riders go.
Now we're left to guess, which means we will stock several kinds of tea, in the hopes of one being to his liking.
He's basically saying, "if you provide tea provide a full tea service or I likely won't like it." If you don't want to provide that, don't.
If that's too complicated he repeatedly says "email me and ask". "Hey RMS, what tea would you like us to buy" would do it. As would giving him $0.75 for the tea bags he brought, if you feel the need.
It's so low maintenance.