Americans are showing an interest in cherry-flavored drinks.  It's an ingredient in three of the five most popular new non-alcoholic beverages this summer.  According to an Shelf Score poll Gatorade Fierce Blue Cherry tops the list, with 66-percent saying they would buy the drink.  But Pepsi Wild Cherry made with Real Sugar is a close second, and a likely purchase for 65-percent.  Meanwhile, 60-percent say Brisk Half & Half Cherry Limeade sounds good to them, landing that drink in a fourth-place tie with Nestle Pure Life Strawberry Melon Splash.  At number three is Protein2o Water, which is getting the nod from 62-percent.