"I don't drink alcohol."
But don't negative forms tend to use は instead of を to stress the negative?
definitely should be correct, as it holds a secondary implication that you drink water and juice and so on but that "Sake is the thing I do not drink."
I remember learning that when negating a verb you should use は instead of を but I can't remember in which instances.
by using は it implies a form of comparison or that the preceding word is what you specifically want to draw attention to
My answer was "おさけをのみません" and was marked wrong. I disagree. What happened to the presumption that a statement without a subject defaulted to the speaker?