Crumble the ground beef into a skillet over medium-high heat. Cook and stir until evenly browned. Add taco seasoning and water; simmer for 15 minutes over low heat.
In a medium bowl, stir together the salsa, cream of mushroom soup and cream of chicken soup. Mix in most of the cheese, reserving 3/4 cup for later.
Place a layer of tortillas covering the bottom of a slow cooker. Scoop a layer of the ground beef over that, and then spoon a layer of the cheese mixture. Repeat the layers until you run out of stuff, ending with a layer of tortillas on the top. Top with remaining cheese.