Japanese Domestic Security is an absolute charm compared to the ruckus of flying internationally. There are never any queues and you're through within minutes unlike US airports. The staff are always polite and charming and you're never treated like the enemy like some TSA agents do.
As for the water thing, I mentioned this before on another thread. Seems it won't be making it's way to International flights. It's exclusively for domestic Japanese flights. I'd love to know how it works...
-mrploddy