But we’re here to talk about single-serve coffee, and while using it for one cup is a little trickier (you’ll have to measure smaller quantities of water and coffee), the Four delivered the same bold, balanced brew in a 5-oz. But what I appreciated is the ability to brew directly into any container; there is no hidden button or latch that the carafe needs to activate to brew or let water through. “Set it and forget it” coffee drinkers should take note that the water reservoir isn’t “smart,” meaning it will brew whatever water is inside, so a full reservoir with a coffee mug underneath will overflow.