Without an available water supply, one may have had to resort to simply wine - undiluted wine. Without food, this wine would have been on an empty stomach.
I’ve never been so drunk that I couldn’t remember the night before (and I’ve certainly tested that limit in a past lifetime), but I know people that have. But I do know that, when drunk, your reasoning and self-restraint can tend to go on a sabbatical, leaving you defenseless against other peoples advances.