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.