“Made with real juice” does not mean it was made with the juice on the label. For example, a pineapple fruit juice may be more apple juice than actually pineapple juice

This gave rise to an amusing misunderstanding in our house. My wife asked for “Cranberry Juice, but 100% juice, not the cocktail; that’s too sweet.” I dutifully went to our store and found the Cranberry Juice cocktail, and also the juice that was mostly apple and white grape juice, because that’s always what they use here when they can. I thought, surely this must be very nearly as sweet, and kept looking. I eventually found the small, expensive bottle of 100% cranberry juice with no other juices and no sugar added.

This was a mistake.

Pure cranberry juice is not popular as a casual beverage for a reason. It is nasty. It tastes like I imagine the least dangerous acid kept behind the counter at the chemistry lab supply company tastes: safe for human consumption, but just barely and definitely deserving to be there behind the counter.