Why do we have to surrender all the water before entering the airport even if we prove that is in fact a drinking water by taking a sip?

Question

But once inside the airport terminal, we can always buy some water and no one will check anymore if you bring the water inside the plane.

In: 974

Answer 1

The dummest part is the the 100ml limit. So I can just pack 5x 100ml bottles of my explosive substance and just combine them in my empty 500ml bottle after security?