All of the vendor products that enter the sterile area at my airport are screened by the TSA, at the checkpoint. Water, burgers, wine, beer, water, Snickers Bars. All of it.

Do we open the water bottles? Nope. The vendor knows where they got it from, and from whom. It’s all a part of the layered security process, the vendor’s vendors are given background screening, as are the vendors employee’s, and we still screen everything they bring in.

Is it a perfect system? Nope, there is no such thing.

So how specifically are the vendors' bottles of water "screened by the TSA?" Do you ETD each one of them? What I have seen is the delivery person roll up to the checkpoint with a pallet of water, present some paperwork and off he goes. Is that your airport's procedure?

Your not going to like the only answer I can give. That would be revealing specifics of procedure, and I cant go there.

I have watched a vendor roll up with a cart loaded with various beverages at a very large airport.

Right through the checkpoint, no one checked anything. Not the person pushing the cart, not what was on the cart and no kind of paper work was presented.

That is security as provided by TSA.