you can put the gun in a zip lock baggie and this is considered being a locked up i.e. in a hoslter or glove box is the same thing as throwing it in a zip lock baggie. They both have to be unlocked to get the gun out. I was trained by a CPD LEO.
As far as drinking. It doesnt matter how much you drink (just like dui's) if they can smell it or tell you've been drinking even if its one they can charge you how they fell.
Now keeping that in mind. I have carried into bars. Resturants when ordering alcohol. Mainly becuase fuck you never know whats going to happen and as long as your not imparing your judgement to bad (i will drink 2 beers at the most when i have my gun) then you will be able to handel yourself and never be put into those situations.
There are freak stuff that happens, like maybe you run into a checkpoint idk something. But as long as your not a fucking RATARD you won't have any issues.