Alton Brown did this on Good Eats. I've meant to try it, but have not gotten around to it. I like CC. IIRC Alton used leftover milk from something else, or visa versa.
I think his recipe was simply some vinegar in skim milk or something like that. Maybe it was lemon Juice...
Day after day, it reappears. Night after night my heartbeat shows the fear. Ghosts appear and fade away. Come back another day.