Place the boneless, skinless chicken breasts into the bottom of the slow cooker.
Season the chicken lightly with salt and pepper, if preferred.
In a mixing bowl, combine the condensed cream of chicken soup, chicken gravy mix, and water. Whisk until the sauce is smooth and evenly blended.
Pour the prepared gravy mixture over the chicken, making sure the chicken is well covered.
Secure the lid on the slow cooker and cook on LOW for 4–6 hours, or until the chicken is fully cooked and tender.
Before serving, use a fork or spoon to separate the chicken into bite-sized pieces directly in the slow cooker.
Serve the chicken and gravy warm over freshly cooked rice.