How to Make It
Stir together the water, beer, and Old Bay seasoning in a 5- to 7-quart slow cooker; add the potatoes, onion, lemon, and bay leaves. Cover and cook on HIGH until the potatoes are tender-crisp, about 2 hours.
Add the sausage and corn; cover and cook on HIGH until the potatoes and corn are tender, about 1 hour. Stir in the shrimp; cover and cook on HIGH until the shrimp turn pink, 12 to 14 minutes. Drain well; discard the bay leaves and lemon slices.