He can ferment any liquid of his choice into alcohol, if it's within a range of 6-8 feet. I imagine knowing chemistry and various plant/food properties make this fun to mess around with and let him brew his own drinks. The bigger the amount the slower the effect: he could turn a glass of water into booze on the spot, but if he wanted to do a whole barrel he'd have to like. Sleep on top of it with his Blessing active all night.

He can use this to speed up or induce intoxication and alcohol poisoning in people by fermenting their blood, also.