hi mama-
you are fighting a losing battle if you feel you can control his drinking.
alcoholics can indeed go 2 weeks without alcohol by white knuckling it thru.
but rest assured, if the only reason he is stopping is to prove he's not an alcoholic, he will be back on the drink. probably sooner than the two weeks. and trust me, it will somehow be YOUR FAULT. he will say you nagged him so much, he had to drink. or he will say you <insert anything here>, so it's your fault.
really, what do you hope to accomplish with this exercise in controlling him?
the only person you can control is yourself, my friend.
regarding your new home, can you bail on that? it would be unfortunate to get tied down to a lease or mortgage when you are already considering leaving the relationship.
is there a backout clause? if so, you might want to spare yourself the legal hassle now.