As to how much to drink, remember, it has caffeine. Although unlike
coffee it also balanced with relaxants such as theanine, how much you want to consume will depend on your tolerance of caffeine. And again, there are concentrates available. The amount really depends on you and how strong you want it to be -- the more you use, the stronger it will be until you max out and have too much to brew. If you buy teabags you don't have to worry over this -- just brew the teabag.