For many diabetics, insulin is about as vital as water. If I have somehow ended up with an effective monopoly on water, would it be murder to price out all the

For many diabetics, insulin is about as vital as water. If I have somehow ended up with an effective monopoly on water, would it be murder to price out all the poor? Would it be murder to stop all access to water? Am I allowed to point to other people and say, well they are not producing water? Or am I morally culpable for my own actions, regardless of the actions of others?