I really don't think the regular layperson is going to be confused into thinking we can tap into it as needed when NASA describe it as the "Most Distant Reservoir of Water" right there in the headline, the first sentence of the article describes it as the "furthest reservoir of water", and the next explains it is "12 billion light-years away".
And even if this hypothetical layperson doesn't know how far a light-year is, 12 billion certainly gets across the point that it is an awful lot of them.
Not sure why this comment is being downvoted. It's technically accurate. The definition of "reservoir" implies that a body of water is being collected or stored for later use. A reservoir need not be artificially constructed (i.e., a well or drainage pool), but in order to be a "reservoir," it needs to be put to use or accessible for use.
I am not a PR person myself, but I think the vast majority of laypeople who stumble across the headline "large, distant reservoir" would assume that the source is tappable. They might also ignore or not really understand the issue of the 12 billion light years -- or the inconvenience, to say the least, of the quasar nearby.
I actually think this was a good move by the PR. I think most people understand that space travel is in its newest form and by calling it a reservoir NASA is challenging science so that one day this distant water can become a practical reservoir.
