What do you really achieve by drinking before you talk to a girl?
Your breath smells like liquor, the "confidence" you get isn't "confidence" but straight up lack of awareness of the situation. If you are drunk, you won't be able to talk right, stand right or do anything right. Your first impression will suck.
Just be open, playful but with restraint, confident with touch of arrogance but not narcissism, mysterious but not closed, open but not an open book.
Jesus christ i once got a girl just because i would read a book in the cafe i go during every work break.