In a medium skillet, brown the ground beef over medium-high heat until no pink remains. Drain any fat.
Add the taco seasoning and ½ cup water. Simmer uncovered over medium heat for 5 minutes or until thickened. Stir in beans.
Place the lettuce in a large salad bowl or divide over individual serving bowls. Top with the seasoned meat mixture, tomatoes, cheese, avocado, and desired toppings.
Top with tortilla chips, salsa, and sour cream.
