In a large pot, combine the water, beer, seafood seasoning, garlic, and salt. Squeeze the juice from the lemons into the water and add the lemons to the pot. Bring to a boil over high heat. Add the potatoes and onions and cook for 8 minutes. Add the sausage and corn and cook for 5 minutes. Add the shrimp and cook for 2-3 minutes or until the shrimp have curled and are opaque.
Using a slotted spoon, transfer the vegetables, sausage, and shrimp to a serving platter (or place on newspaper) and sprinkle with a little seafood seasoning. Serve the broth in mugs, if desired.
Serve with lemon wedges, melted butter, and hot sauce.