So, what is water used for?
- Drinking (obviously)
- Making food
- Radiation shielding
- Bulk material (when staying outside of the Ice line, preferably)
- Coolant fluid
- Heat sink mass
- Reaction mass (if you are using a solar thermal, nuclear or antimatter drive)
- Chemical fuel (for when fusion drives are impractical, like manoeuvring thrusters, or when next to things you don't to glow blue like spaceports)
- Hydrogen nuclear fuel - if you can manage pure H1 fusion without a handy star to crush it
And I'm probably forgetting a few...
Also note how the last ones are not recyclable, and all around guzzling like there's no tomorrow.
If you don't believe me, look at those companies that want to start exploiting space resources. The one think they absolutely prioritize, before iron, before platinium, before Helium-3, is water. There are very good reasons for that.
Or look at this page and search for the word "water".
So it's like space oil, but that you also need to survive.
Seriously, such high-performing torch engines are borderline magical. We currently have no drive both that powerful and efficient imagined - and we imagined turning the central galactic black hole into a power station, and how we would do it.
The only thing we have that is remotely in those performances is a high-end antimatter engine, and they are using plain hydrogen.
Not to mention the thing is many orders of magnitude more efficient that anything we can devise, given the absence of oversized heat radiators.
Sure, pure, optimal fusion sounds a lot on paper, but that's before you realize how vast space is - and how much an utopian 10% loss in waste heat means in necessary radiator size to not melt the hull.
Not dissing on the show here, mind you - it does a good enough job elsewhere to be more than fine. But we'd better be careful with those assumptions born out of (otherwise great) Star Wars or Star Trek space fantasy on how space really works.
And that manoeuvre was actually exactly what a real spaceship would have done (assuming a real spaceship would have a magical torch drive, of course). They're not stopping, they're turning around and changing course (at several g) to intercept and match an object on a wildly different vector.
They follow the events, what kind of people the characters are and what the world is like. For me, those are the main elements, so as long as they are kept and they don't screw the presentation, it's faithful enough.
We'll see how it holds up with time, though.
I may end up doing like you in the end, better watch it at our own pace.