It has not occurred to Crowley to be suspicious of such a thing, and he's used to having a bulletproof constitution, so he drinks without any hesitation. "Huh. Not sure if I've ever actually drunk water before." He eyeballs the glass. "Sort of has a flavour? Not bad."

"Eeeeehhh, technically, no?" He wobbles a hand vaguely in the air. "Not supposed to, anyway. I'm only meant to do acts of evil, I've got in terrible trouble before for getting caught doing good deeds. But I can."