Heat oil in a deep-fryer or large saucepan to hot. Whisk eggs and water together in a bowl; set the egg wash aside.
Sprinkle the fish fillets on both sides with Cajun seasoning and lemon pepper. Coat the fillets with flour and shake off any excess. Dip the fillets in the egg wash, then dip fillets in the crushed potato chips.
Fry the fish until lightly browned, about 4 minutes per side. Serve with lemon wedges.