They drank water within 24 hours of commiting the crime too.
Bottled?
From where?
Was a time we'd realize that lunatics exist, and the solution from an individual prespective was one's right to defend oneself.
But you're right, could come a time that water will be an issue.
They put stuff in it years ago to prevent cavities you know, and the plastic bottles of today aren't safe.
Drink water, no guns, it's a reasonable precaution.