ALL grape juice is “watered down.”
All grape juice is made from concentrate, to which water is then added.
The “light” grape juice, as far as I know, just has more water added to it.
It’s no less “grape juice” than the regular product is.
Personally, I buy the regular and add my own water.
If you think I’m wrong try getting Kedem to deny that they’re doing anything other than, when they reconstitute the concentrate, adding more water.