Originally Posted by
Restingvoice
I think I've seen a panel of him pouring a drink and took a sip and also have seen him say he doesn't drink. I think it depends on the company.
Realistically I say people who are obsessed with control don't drink. They can, just not drunk, and the safest way is to not drink. He can hold it in hand for show, take a bit of sip, then dump the rest in a nearby potted plant. I don't know if this has happened but I can see him doing it in a gala or other public events Bruce Wayne attended.
Oh yeah he fake drink in Batman Begins too.
I think he can drink a glass for dinner or entertaining guests, or when relaxing with people like Alfred, Selina, Clark or Dick, but even then not much more than that. I don't think I've ever seen him drunk. It won't be realistic to his character anyway.