>we prove that is in fact a drinking water by taking a sip?
Just because you can drink it doesn’t mean it’s water.
>we can always buy some water and no one will check anymore if you bring the water inside the plane.
The water that’s sold in the terminal has been inspected/vetted by the security company prior to the supply contract being signed or the water brought onsite. By having everyone toss their water before/at the security checkpoint, they know that all water that’s being brought on the plane is actual water.
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