Steelheadman, your steamers will die in fresh water. Then putting them in the frige will have some dead for up to two days. When you steam them the dead ones will not open, or will have opened in the fridge, so don't eat those to be safe. Next time before you leave the beach fill a couple buckets with as clear of salt water you can. Change the water a couple of times in the next two days with of without cornmeal and your steamers will be as clean as they get.