Bring water, beer, OLD BAY Seasoning and salt to boil in 12-quart stockpot on high heat. Add potatoes and onions. Cook 8 minutes. Add smoked sausage. Cook 5 minutes. Add corn. Cook 7 minutes. Stir in shrimp. Cook 4 minutes or just until shrimp turn pink. Drain cooking liquid. Pour contents of pot into large serving bowl or platter. Or, mound on paper-covered table. Sprinkle with additional OLD BAY Seasoning, if desired.