Brown ground beef in a large skillet over medium heat until crumbly and no longer pink, about 10 minutes; drain excess grease. Mix in taco seasoning mix and water. Bring the beef mixture to a boil and cook until thickened, about 10 more minutes. Transfer beef to a serving bowl.
Place chopped onion, lettuce, cherry tomatoes, Cheddar cheese, black olives, salsa, jalapeno peppers, sour cream, and corn chips in individual serving bowls. Allow diners to assemble their own salads from the ingredients.