Meanwhile, in Dutch oven, heat oil over medium-high heat. Add chicken; cook 4 to 6 minutes, stirring occasionally, until no longer pink in center. Stir in bell pepper, chiles and onion; cook about 2 minutes longer or until onions just start to soften. Add taco seasoning mix and water. Simmer 3 to 4 minutes, stirring frequently, until slightly thickened. Transfer to bowl, and reserve.