If fruit flies get into fermenting wine they turn it sour. Don’t know what they’d do to vodka. If it was me, I’d remove the larvae and set aside well corked for a couple of years and mark the bottle so you don’t forget its history.

Meanwhile make another batch. Make sure that the grog is always well corked from the word go. If there are fruit flies around don’t make it.

I’m impressed by the breadth of recipes that your event has generated. Well done!