If I wanted to drink I would be drinking right now. If you're asking me why did I drink before, you have to ask me that because it's a different question. Are you asking me if I have a yearning to drink right now? I don't. I am too sick of it. You ask me why do I continue to pick up the bottle, but I am not? Why did I continue to pick up the bottle a month ago? That's a different question as well, and you need to ask me that if that's what you mean.
I'm not picking up the bottle right now, and I don't want to drink right now. I don't know how else to answer that question if you really do mean the present tense.