"I am no lawyer (I just play one on the internet), but it seems like manslaughter charges are not out of the question."
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I'm not a lawyer either -- I just work for them, and they aren't criminal lawyers. But it seems to me, from what the Sheriff said...that no one put a gun to her head and forced her to drink all that water...there doesn't look like criminal liability here. Civil? Oh yes. This is a litigous society after all.
Putting a gun to someone's head is not an element an involuntary manslaughter. The question probably comes down to whether it was the employees actions that caused the death or was it the actions of the individual. The employees created the environment for the action to occur, but since it was not their actions directly that resulted in the death they may be off the hook. If a DA wanted to, he could probably persue a case.