In a large skillet, cook beef over medium heat until no longer pink; drain. Add water and taco seasonings; simmer for 5 minutes.
In a large bowl, combine cream cheese and milk; spread on a 14-in. serving platter or pizza pan. Top with meat mixture. Sprinkle with chilies, tomatoes, onions and lettuce. Drizzle with barbecue sauce. Sprinkle with cheddar cheese. Serve with corn chips.