It could be worse, they could make it like some other civilizations in that area... by small jawbreaker sized balls using the solid ingredients, then placing one ball at a time in their mouth, chewing it for several minutes before spitting everything in a large pitcher and repeating the process until they have dozens of gallons of spit, saliva, yeast, corn and other various ingredients sloshing around in a large vat waiting to ferment and then happily consumed by the locals without being filtered or screened or anything. I imagine it is like drinking straight vomit mixed with flat stale beer... yum.