You are referring to a PAN Disrupter, a device that uses a small charge, like a shotgun shell, to propel a jet of water with extreme force, with the goal of separating the bomb’s components as quickly as possible without flame or explosion touching the bomb.
But is that real life? That’s something done by some fictional evil mastermind that wants to toy with the hero. In real life they hide the thing, don’t let anyone know about it, and set it off remotely.
But he did it out of desperation, because of a lack of other options, not because he realized that removing the detonator or unhooking the battery would be sufficient. Plus he idiotically waited until literally the last second when his options had run out a while before that.
Some do use liquids. But it acts more like a shaped charge than a hose.
I suppose the factual answer is if someone left a bomb designed to not be diffused, they might wire multiple detonators, triggers, batteries and decoys so that if you try to pull one detonator, another one goes off.
Of course, the most egregious example is Die Hard with a vengeance. Simon sets up this elaborate explosive device in a school. The bomb squad struggles to disarm it before it goes off, but it’s too complex. Here’s the thing. They make a point of showing how Simon’s devices are binary explosives. e.g. they are perfectly safe so long as the two components don’t mix together. So all they really have to do is drain one of the containers or destroy the elaborate mixing mechanism.
You can very easily design a circuit to fire the charge by unhooking the battery.
All bombs are designed to be diffused. In fact, the parts of the bomb will diffuse very, very quickly.
What you want to do with a bomb you find is to defuse it, not to diffuse it.
But if you are operating a remote device from Quite a Long Way Away, so what?
If you are trying to set off the bomb, then you are right. Who cares.
If you are trying to defuse it, getting the electronics wet isn’t a good plan.
Don’t worry, I’m sure TSA will catch it at check-in.
They’ve got a special bin for those.
You have greater confidence in the reliability of electronics than I. Especially home made electronics.
So, do Bomb Squads in th’ movies discriminate against color-blind agents?
My point isn’t that water won’t break the electronics. My point is that in the process of breaking the electronics, by shorting capacitors and whatnots, a very tiny short caused by the water could trigger the shot.
True - I’m sure in real life it is like you describe, although maybe still with a few booby traps to kill responders.
Since this is Cafe Society though, I presume we are talking about bombs that are designed to entertain. 
Disclaimer: I am in no way an expert on bombs or electronics.
There was a comic book, “Albedo,” where someone had left a nuclear device ticking away…and the heroine just shot it with a high-velocity anti-tank round. Yeah, some Plutonium contamination, but, given the choices…
Or not enough. See msmith537’s link. Anyway, that’s what the shotgun is for.
That one makes sense, at least. You use different colored wires in electronics because it makes it easier to tell which wire is going where. And when you’re building a bomb, getting that wrong tends to go very poorly for you, so you probably want to make extra sure you don’t make that mistake.
The entire purpose of the PAN Disrupter is to separate the components of the bomb as quickly as possible, so they don’t have a chance to send the signal.
Certainly those who use such a device aim it so the supersonic slug of water strikes the safest spot, scattering everything.
For the record, pure water is not a conductor by itself, and it won’t have time to dissolve any salts to become a conductor before the kinetic energy has torn apart the bomb.
These devices are quite effective in making a bomb safe.
Don’t forget the extra wire that when cut causes the timer to count down faster. Bomb makers have a sense of humor that way.