Add the water, taco mix, Rotel, pinto beans, green chiles, olives, and corn to a 5-quart or larger slow cooker. Stir everything together and then add chicken breasts into the crock.
Cover and cook on LOW for 8 hours.
Take the chicken out of the slow cooker and put it on a plate of cutting board. Use 2 forks to shred the chicken. Then add it back to the soup and stir.
Ladle the soup into bowls and add your desired toppings. Serve warm.
Notes
Nutritional information is for soup without toppings.