My friend e-mailed this to me today:
You can't make a horse drink water if he still prefers beer or is too crazy to know what he does want. Set a pail of water beside him, tell him how good it is and why, and leave him alone.
"If people really want to get drunk, there is, so far as I know, no way of stopping this - so leave them alone and let them get drunk. But don't exclude them from the water pail, either."