I understand that trademark is for the benefit of the consumer. Not being a lawyer though, is it just supposed to protect me from getting a fake product, or also give me some assurance as to the source of the product?
Could I create a snack and call it Pepsi Chips? As long as I don't use their logo?
I can see as to how both these products being beverages someone could be confused as to who the manufacturer is.
Coke and Pepsi may rightly believe that someone could not make a bottled water and call it by their name. Even though they do not sell one with their name on it.