Preheat oven to 325 degrees.
In a large skillet, brown meat and drain off fat. Stir in tomatoes, onion, taco seasoning, soup and water. Simmer over medium-low heat until everything is well combined and heated through.
Grease a 9×13 casserole dish. Put down a layer of crushed tortilla chips, followed by a layer of the meat mixture, then half of the cheddar cheese. Repeat layers.
Cover with foil and bake for 20-30 minutes, or until bubbly.Let sit for 5-10 minutes before serving. Top with sour cream and salsa.
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