I don't know if ever tried to make a cup out of your enemies skull but it's not that easy. A skull is full of holes that you have to fill and make water proof. All the while using materials that won't dissolve in fluids and won't poison you. It's easier if you turn it upside down but then you have to create a base to keep it from spilling.
You have to seal quick dry clays for them to be waterproof or use an oil based one but none of them are really recommended for drinking. Especially if you plan on drinking any caustic like alcohol. The only way to really do it is with firing it to harden the clay and then glazing it and firing it again. Skulls really don't do well in a kiln. Bone becomes really brittle and even more porous when exposed to high heat that doesn't burn it.
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