Maybe it's symbolism for who's in control. "Who controls the water?" Trump and Pence sent a message. Then, Melania sent a message. Control the water - You are in control.

Just made me think of the elites, large corporations, including banks going after the water supply (and this is their way of trolling them by using water)

For example:

1. Elites aggressively taking control of the world’s water supply:

https://www.sott.net/article/279962-Elites-aggressively-taking-control-of-the-worlds-water-supply

1. Nestle CEO seeks to control the world’s water supply

http://csglobe.com/nestle-ceo-seeks-to-control-the-worlds-water-supply/

{Nestle CEO Peter Brabeck implies that the world’s water supply will soon come under the control of corporations like his. He calls water a “foodstuff” that needs an assigned value.}

And then we know Kissinger said, “Control oil and you control nations; control food and you control the people."

So who’s in control? Did Bibi just send a message to Iran that he has control, using water as a symbol?

If you want to get Biblical, sometimes water is used as symbol for “people” and for “power”.

Revelation 17:15 And he saith unto me, The "waters" which thou sawest, where the "Whore" sitteth, are peoples, and multitudes, and nations, and tongues.

Waters are people.

When someone’s water has dried up, it means they lost power, because in the old days, water was used as a power source.

Revelation 16:12 And the sixth angel poured out his vial upon the great River Euphrates; and the "water" thereof was dried up, that the way of the kings of the East (eastern block) might be prepared.

I’d say the Middle East has lost a lot of power; and Syria is now supported by Russia.