If 'at will' permits me to use a bottle of vodka and a shot glass, then yeah, I can do it. Actually, shots of anything make me vomit. Almost every time I have drank I'll have a shot or a mixed drink, go spew, and come back out and drink some more and be fine for the rest of the night. Empty or full stomach, its like a reflex at this point.
I still enjoy drinking. Beer is great.