For Breaded Cod: Combine flour and starch in bowl. Combine cracker crumbs and pieces, bread crumbs and salt in second bowl.
As needed, pat fish dry with paper towels. Coat each piece with flour mixture, shaking off excess. Place on sheet pan. Add water to remaining flour mixture in bowl. Whisk until smooth.
Dip each floured fish piece into batter, then coat with crumb mixture. Fully cover fish with crumbs, gently pressing mixture into batter. Place on sheet pan.
Fry breaded fish pieces in 340ºF oil 3 to 4 min. or until golden brown and internal temperature registers 145ºF.
For each serving: Warm 1 tortilla. Top with 1/2 oz. slaw, 1 fried fish stick, 3/4 oz. salsa, 1/4 oz. cheese, 1 oz. avocados and 1/4 tsp. cilantro.