The very popular kosher grape juice brand which shall remain nameless so the thread doesn’t close has multiple types of the glass bottle. There’s the organic glass bottle (which I assume is the 100% real juice you’re talking about; it leaves a purply powder residue), and the non-organic. Not sure if the non-organic glass ones have concentrate.
How can something have concentrate without water to balance it out? That would just end up being pretty much syrup. Maybe they aren’t required to list water as its own ingredient up to a certain point?