Place the ground beef in a large skillet over medium heat. Brown the meat and break into small pieces with a wooden spoon. Then stir in the taco seasoning and 1/3 cup water. Simmer until the water is absorbed, then remove from heat.
Mix the sour cream with the ranch dip mix. Chill until ready to serve.
Chop the lettuce and pile in a large serving bowl. Toss with the Catalina Dressing and add a little more if you so desire. Then pile the taco meat and beans over the top.
Next pile on the crushed Doritos, tomatoes, green onions, avocado slices, olives, and cheese. Finally, top the salad with a heaping portion of ranchy sour cream and serve!