Assume that it is impossible to rephrase. I am inclined to believe drunk is correct, but I need another opinion.
closed as off-topic by tchrist♦, Julie Carter, anongoodnurse, Chenmunka, TimLymington Sep 1 '15 at 23:08
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The past participle is "drunk". "Drunken" is an adjective, its use as the past participle is obsolete.
I have drunk the water, while my drunken father has drunk another beer.
Next time you may prefer to check out a dictionary to avoid people's angry comments.. :)
Though the origin of both words is the same, the usage is different.
drunk is the p.p. of drink, and you're right to use it in your example:
I have drunk the water
drunken is an adjective meaning that someone has drunk alcohol more than he can handle: (similar to another usage of drunk):
He's really drunk.
They are a bunch of drunken idiots.