I'd actually allow the beer as well-- at least that would be pure for drinking.
And whiskey has many medicinal purposes in an emergency.
SD
Read a site today that said if you add red wine to water it can act as a purifier. Not as good as clorox, iodine, or peroxide, but better than nothing.
Of course, if you had the red wine, why would you add it to the dirty water, LOL.
Seriously though, 1 part red wine to 3 parts water has an antimicrobial effect on the water (won't prevent giardia or cryptosporidia though.)
http://millennium-ark.net/News_Files/LTAH_Water_Pure2.html