Shia LaBeouf, dubbed “Hollywood’s bad boy,” gave up the booze after a series of incidents including a bar brawl and a car accident — but says he’s such a dedicated method actor, he drank moonshine for his role as a Prohibition-era bootlegger in “Lawless.” “My drinking on this movie was as undestructive as I could possibly make it, if that makes sense,” he told us at a Cinema Society and Manifesto Yves Saint Laurent party Monday. “I did it for the movie. I didn’t drink off set for no reason. I did it because, when I showed up on set the next day, my [bleep]ing eyes looked like this and my face . . . had that drunk bloat that I needed, that I couldn’t have if that wasn’t going on.” LaBoeuf noted, “Moonshine is different than liquor. Moonshine is closer to heroin.” He told us at McKittrick Hotel rooftop bar Gallow Green that he was so in character, he frightened co-star Mia Wasikowska. “She was calling her attorney, like, ‘Get me the [bleep] out of here,’ ” he said. Although they became friends, “Mia was ready to walk away from the movie. I was really pretty aggressive about it, and not in any kind of weird, strange way, but I don’t think she had ever experienced anything like that.”