Colorado Kool-Aid (Coors beer, from Colorado)

Coors beer (from Colorado) is so weak that some have called it Kool-Aid. “Colorado Kool-Aid” is popular Texas slang for Coors beer.
 
 
(Historical Dictionary of American Slang)
Colorado Kool-Aid n. [Sugg. by Kool-Aid, a trademark for a sweetened soft-drink mix; Coors beer is brewed in Colorado] Coors brand of beer. Joc.
1972 Jenkins Semi-Tough 33: Big-un would drink a lot of that Colorado Kool-Aid.
1977 Univ. Tenn. student: In Texas, Coors is Colorado Kool-Aid.
1983 K. Weaver Texas Crude 66: Colorado Kool-Aid. Coors beer.
 
 
http://en.wikipedia.org/wiki/Kool-Aid
Kool-Aid is an artificially flavored soft drink concentrate made by Kraft Foods. Kool-Aid is sold as a powder to be mixed with water and a sweetener (sugar or an artificial sweetener). Some versions include the sweetener with the flavor concentrate, only requiring the addition of water. 
 
 
http://en.wikipedia.org/wiki/Coors_Brewing_Company
The Coors Brewing Company is a regional division of the world’s fifth-largest brewery companies, the Molson Coors Brewing Company. According to the Molson-Coors website, the division is the third-largest brewer in the U.S. The brewery in Golden, Colorado is the world’s largest on a single site.
 
 
25 May 1971, Lima (Ohio) News, pg. 18:
From here it looks…
...like our friend Lee Trevino has forsaken a bit of his heritage by refusing to drink Mexican tequila. Lee tried the stuff once and called it “cactus juice.” Trevino says he’s tried just about everything else—kerosene, hair oil, even Sterno—but he won’t drink tequila. In fact, when Lee was in town a couple of summers ago he ordered some beet brewed in the southwest which he referred to as “Colorado Kool-Aid” but made sure nobody tried to pawn any tequila off on him. The spicy sauce from south of the border hits him just like a laxative, Trevino says.
 
 
11 October 1973, Oakland (CA) Tribune, pg. 34:
Fred Glover, the Seals temporary coach, took a swig of Colorado Kool-Aid and smiled.
 
 
4 February 1975, New York Times, pg. 28:
Coors: Beer of Beers or “Kool-Aid”?