Cook crumbled hamburger until no longer pink. Add taco seasoning and water and cook according to the taco seasoning directions. Allow hamburger mixture to cool for about 15 minutes.
Put Doritos on four plates or a large platter (as few or as many as you like). Top with cooked, cooled hamburger. Sprinkle with toppings of your choice, and lastly top with the Tex-Mex or cheddar cheese.