Ocean Spray Cranberry Juice Cocktail is 27% juice. It says so on the back in small print because FDA makes them put it there. The rest is water and sugar, plus vegetable concentrate for color because 27% cranberry isn't red enough on its own. The front says no artificial flavors, which is true, and 100% Vitamin C, which is added.
Cranberry juice at 100% is close to undrinkable, it's that tart, so everybody dilutes it. Cocktail is the legal way of saying juice drink without saying juice drink. Ocean Spray is a farmer owned co-op and they aren't hiding any of this, the percentage is on every bottle. It's still three quarters sugar water with a fruit on the label.