DES MOINES — A Senate subcommittee on Thursday advanced a bill that would allow grocery and convenience stores to opt out of accepting empty beverage containers that are now covered by Iowa’s 1978 bottle-deposit law.Under Senate File 368, retailers could refuse to accept beer, soft drink, liquor and other nickel-despoit containers effective July 1, 2022, if an authorized redemption center is within 20 miles of their businesses.People would have to take their empty cans and bottles to those centers to reclaim their nickel deposits — as is the case at many stores now because of COVID-19 restrictions.