You buy that box and go home to have a glass and it is so nice. The next day you have some and it is eh, ok. All the days after that it is nothing more than flavored water. Tea is weird like that. The goodies take so long to recharge and are quick to deplete. Three weeks to get back to baseline. That is why we may drink tea but we depend on coffee. Despite the odds, green tea has conquered the world, and that is a good thing.
I’m using Twinnings Gunpowder Green Tea, but I imagine most any green tea will do.