Take a baby stroller, even if you don't have a baby, just put a doll in and wrap it with blankets and make it look like a sleeping baby. The rest of the carriage is yours fill with water bottles or milk bottles full of vodka. Just be careful, if you actually are pushing along a baby to not give them the wrong bottle. Security never check strollers, and if they want to, say, "fuck off my baby is sleeping."