Small bottles of alcohol have historically become currency during instances of war and/or hyperinflation - there are reports of this during both the Bosnian war and WW2.
The problem with it long-term is that it's a deflationary currency. Liquor gets consumed; once you pay a drunk with a bottle of alcohol, he tends to drink it and take it out of circulation. This means the value of alcohol goes up as the crisis continues, which means people have an incentive to hoard rather than circulate it, which means that it eventually loses its utility as a currency.
The problem with it long-term is that it's a deflationary currency. Liquor gets consumed; once you pay a drunk with a bottle of alcohol, he tends to drink it and take it out of circulation. This means the value of alcohol goes up as the crisis continues, which means people have an incentive to hoard rather than circulate it, which means that it eventually loses its utility as a currency.