I'd thought about it, but the amount it would take to even make a dent in my caffeine addiction would taste nasty.
And caffeine does taste horrible. A friend of mine, back in high school, had a bag of pure caffeine once. He was one of those independent souls. Well, the cops came and found it one day. "Hey, look, alkaline white powder!" Whoops. I think if he'd been an adult they would have locked him up on sheer principle.
Yeah, it tastes that nasty.