In large resealable plastic bag, combine first 5 ingredients. Add fish, 1 at a time; shake to coat. Whisk eggs & water in shallow dish. Place potato flakes in another shallow dish. Dip each fillet in eggs, then coat with potato flakes. Dip fish again in eggs & potato flakes.
In large skillet, heat 3 Tbsp. oil over med-hi heat. Cook fish in batches for 3-4 min. on each side or until fish flakes with fork, adding oil as needed.