I think that that might make the ethanol evaporate, as it’ll do so more-readily than water.
It seems to me that that would have two effects:
That would presumably cause the ethanol content to drop over time. You’d either have the impact fall off, or need to replenish it. I’d suggest a small Cupid statue urinating pure ethanol into the Four Loko fountain.
If you can evaporate enough of it, maybe you can get enough ethanol vapor going on to get everyone in FlyingSquid’s Panera’s establishment drunk from breathing. I dunno if fountains would be enough, though. I’m thinking maybe add some of those ultrasonic misters, which would create a mysterious Four Loko fog at ankle level and add to the ambiance.