Beer
The ancient Sumerians, who built advanced city-states in the area of present-day Iraq, began fermenting beer from barley at least 6,000 years ago.
When people started agriculture the first crops they produced were barley or wheat. You consume those crops as bread and as beer. It's the drink associated with the dawn of civilization. It's as simple as that.
Beer was popular with the masses from the beginning.
Beer would have been something that a common person could have had in the house and made whenever they wanted.
The guys who built the pyramids were paid in beer and bread. It was the defining drink of Egypt and Mesopotamia. Everybody drank it. Today it's the drink of the working man, and it was then as well.
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