Tea is Tea; yes, I’m sure there are some elite or better quality brands but I get a good quenched thirst from some rather ordinary teas, brew green and let it brew, let it get cold in the fridge, drink on a hot day, very good.
There is a whole book on green tea, good stuff but there is extract for people who really want to max out on its benefits.
And what? The Brits saying something like they’ll have tea when actually it’s a small meal in the afternoon.
My mother, from West Virginia, always had iced tea for us in the summer, bless her! I actually take the green tea extract myself. If you look at the effective doses for studies of Japanese tea drinkers, it involves drinking six plus cups of tea a day!