None will get filled.
It's a closed system; that one drop goes into the first cup. 😉
I feel smart now.
Discussion
The faucet is there for illustrative purposes. It's only about the drop of water?
If you assume that the disconnected faucet will keep pouring water, you can assume a lot of things. Maybe there's a magnetic field & the water has metal in it? Maybe the image is upside down? 🤷♂️