On my recent trip to Canada and US I took my metal Hivefest water bottle. I did empty it before going through security and found water fountains to refill it on the other side. None of the security people even mentioned it, but I took the precaution anyway.
I remember when this stuff started coming up that I could not even take toothpaste in checked luggage on a flight to Ireland. There has to be some sensible balance between security and practicality.
I have flown with El Al a couple of times, so I know what their security is like. I got grilled by their guys.