Deductions for Certain Losses of Alcoholic Beverages; Authorizes distributor of vinous, spirituous, or malt beverages to make excise tax deduction in its monthly tax report for alcoholic beverages that have become unsellable through warehouse breakage, spoliation, evaporation, or expiration or that have become unfit for human consumption; requires distributors that distribute more than one type of alcoholic beverage to deduct their gross taxes for products according to those specified in specified manner; excludes extraordinary losses of vinous, spirituous, or malt beverages from such deductions; authorizes distributor to deduct actual gallonage of extraordinary loss.