In a pot, combine the water, white vinegar, and seafood seasoning. Bring the mixture to a boil over high heat.
Add a steamer basket or colander to the pot, turn the heat to medium-low, and add shrimp. Cover with a lid.
Steam the shrimp for 2 to 5 minutes until they turn pink and are firm. Remove from heat, drain, and transfer to a serving dish. Serve right away with parsley sprinkled on top and lemon wedges on the side. If desired, enjoy with cocktail sauce.