Unified Ferments, a five-year-old company, makes these beautiful beverages in a former Pfizer plant in Brooklyn. Its variations include soba, a deeply toasty buckwheat tea; hojicha, an earthy, nutty roasted green tea; rhododendron, a vegetal, dill-inflected herbal infusion; and Wen Shan Bao Zhong, a perfumed, citrusy oolong. Each tastes nuanced and delicate, with layers of flavor and a lightly tangy acidity — thanks to the fermentation — that makes the drinks extremely food-friendly.