maybe a hefeweizen? two weeks isn't really long enough. maybe brew a russian imperial stout or something really big and strong and then drink it when he gets back. party!
'Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne.'
—Kurt Vonnegut, Breakfast of Champions