In a slow cooker, combine the chicken, bell peppers, onion, taco seasoning, water, and lime juice.
Cover and cook on low for 6-8 hours, or on high for 4-5 hours, or until the chicken is tender and cooked through.
Serve the chicken and vegetables over warm tortillas, with your favorite toppings like shredded cheese, sour cream, guacamole, and salsa.
