1/4 pound sliced bacon
1 tablespoon butter
2 onions, chopped
2 cups water
1 cup bottled clam juice
3/4 pound boiling potatoes (about 2), peeled and cut into 3/4-inch chunks
1 rib celery, chopped
1/4 teaspoon dried red-pepper flakes
1 1/4 teaspoons salt
2 cups fresh (cut from about 3 ears) or frozen corn kernels
1 cup milk
1 cup heavy cream
1 1/2 pounds cod fillets, cut into 1 1/2-inch chunks
1/4 teaspoon fresh-ground black pepper