There aren't MANY people(only ten, more or less) who know all the ingredients of these drinks.
That's because A LOT OF the ingredients are sectret, but not all of them.
In a can of drink there is SOME water-water constitutes more then 95% of the total.
Usually the drinks are very sweet because there is A LOT OF sugar.
But in drinks like Diet Coke or Diet Pepsi there isn't ANY sugar (0%)
In traditional Coke and Pepsi there's A LOT OF caffeine in the ingredients, but there isn't ANY caffeine (0%) in the special caffeine-free versions.
Some people say that these drinks sre bad for us because there aren't MUCH natural ingredients, only two or three.
That's one reason why, personally, I don't drink MUCH Pepsi or Coke , but Ido drink it sometimes.