This is the recipe that I always use when cooking steamed shrimp, found on a tin of Old Bay seasoning.

1/2 cup apple cider vinegar
1/2 cup water
2 tablespoons Old Bay seasoning 
1 pound large shrimp, peeled and deveined, leaving tails on
1 tablespoon butter*


In a medium saucepan, mix the vinegar, water, butter* and Old Bay. Bring to boil on medium heat. Gently stir in shrimp, then cover.

Steam 2 to 3 minutes or just until shrimp turn pink. Drain well.
*I always add butter, even though it isn't included in the original recipe.

Source: Old Bay®