In the super deals for 7/28 - 8/3 it has Dr. Pepper listed 4 / $5. Pepsi does distribute Dr. Pepper where I live, but can I really use the Pepsi coupon on coupons.com? It doesn't have a picture of Dr. Pepper. How would I prove to the cashier that I can use the Pepsi coupon on a Dr. Pepper product? Thanks for the help.