Easy Slow Cooker Chicken Soup

2 cups water

1 (10.75 ounce) cancondensed cream of mushroom soup

4 skinless

boneless chicken breast halves

1 onion

chopped

1 cup chopped celery

1 cup chopped carrots

3 small baby bell peppers

chopped

1 (1 ounce) package dry onion soup mix (such as Lipton®)