It's not your job to apply any therapy to your wife. It's also insane to think that her drinking something will somehow help her stop drinking. Actually, properly insane in the sense of doing the same thing over and over again expecting different results. When you give her that bottle, she will not appreciate any irony, she will think exactly the same thing as anyone else would. 'oh lovely, I will enjoy that later' except her needed mind will add 'he obviously doesn't think there's a problem either, see I new i am not an alcoholic' bud more delusion and more drinking.
My opinion, find another therapist. One with a degree in psycho therapy specializing in addiction. Someone who actually has a clue!