In general, you shouldn't have to ask if the establishment serves alcohol--they are supposed to post signs to the effect that it is unlawful to carry weapons, yadda yadda yadda.
The signage is standard and consists of red text on a white background--if posted, you shouldn't miss it.
"'Humankind cannot gain anything without first giving something in return. To obtain, something of equal value must be lost.' That is Alchemy's first law of Equivalent Exchange. In those days, we really believed that to be the world’s one, and only, truth." --Fullmetal Alchemist