here is what I found.
The first whiskey ever served in a saloon was not the fine whiskey that New Yorker's or those from Chicago would sip. This stuff was raw and made right in the camp or town. The simple ingredients included raw alcohol, sugar burnt and a little pouch chewing tobacco. Whiskey with terrible names like "Coffin Varnish", "Tarantula Juice", "Red Eye" and others were common among the early saloons.
Later the word "Firewater" would be used to describe Whiskey. It took on the name during trading with Indians. To explain what Whiskey was to the Indians, the cowboy would pour it over the fire to show its potency. With a high enough proof, Whiskey acted like gasoline on the fire. Soon firewater was the name of the drink. If you were a light weight and sipped your whiskey, you could be certain to find yourself drinking a 5th of Whiskey at gun point. Sipping was considered a weakness and not tolerated!
Beer was not as common as whiskey, yet there were those that drank it. Since pasteurization was not invented yet, a cowboy had to take his beer warm and drink it quick. If not, the beer would get warmer and go flat. Whiskey kept its taste and potency no matter the temperature. It was not until 1880′s that Adolphus Busch invented artificial refrigeration and methods of pasteurization to the brewing process. Soon after Budweiser launched as a U.S. national brand.
In the late 1820′s, Bent's Fort, Colorado opened what we know as the first saloon in the west. There were a few little towns which already had cantinas, but they did not compare to saloons that would soon spread like wild fire throughout the west.