I was facetious about papyrus, but here's a link that supports of Troy in the barley guess:

http://www.hmc.org.qa/hmc/heartviews/issue9/ALCOHOL.htm

On this web page there's a mention of cabbage juice as having been a cure for a hangover. Cabbages in Eygypt? Liver and learn.

Beer regards (I hate the stuff),
WW