Drugs, more specifically pills named for their color. They are usually tablets of Seconal(tm) or, generically, secobarbital. The Grateful Dead refer to reds in their song Truckin' with the lyric, "What in the world ever became of Sweet Jane? She lost her sparkle, you know she isn't the same... livin' on reds, Vitamin C, and cocaine, and all that a friend can say is 'Ain't it a shame.'" One might survive for quite a while (with enough water) by inducing sleep with reds, waking up with a toot of cocaine, and taking vitamin C to supplement whatever junk food you're eating.