Clam Box Fish Chow-Da

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1/4 pound unsalted butter

1 large onion, diced

2 1/2 pounds waxy-style potatoes, peeled and cut into 1/2-inch cubes

3 tablespoons salt

1 tablespoon ground white pepper

Water, as needed

5 pounds boneless, skinless cod fillets

6 cups half-and-half

2 cups whole milk, plus more as needed

Oyster crackers, as needed