As the popularity of relaxation beverages soars, grocery stores like ShopRite, increasingly are adding them to store shelves. ShopRite, which operates 190 grocery stores in New Jersey, New York, Connecticut, Pennsylvania and Delaware, has added RelaxZen DAY and RelaxZen NIGHT products from RelaxZen Inc. to its product line. RelaxZen’s 2.5-ounce tapered bottles being added to…