In a large skillet, cook beef over medium heat 6-8 minutes or until no longer pink, breaking into crumbles; drain. Stir in taco seasoning and water; bring to a boil. Reduce heat; simmer, uncovered, 4-6 minutes or until thickened, stirring occasionally. Cool slightly., In a large bowl, toss lettuce with cheese. Top with beef mixture and chips; drizzle with dressing and toss to combine. Serve immediately.