1. Combine fajita mix, water, and oil in a medium mixing bowl. Add chicken to marinade; stir to coat. Let stand at room temperature for 15 minutes.
2. Preheat a large wok coated with cooking spray over medium heat. Add peppers, zucchini and onion; cook for 2 to 3 minutes, or until crisp-tender. Set aside.
3. Drain chicken; discard marinade. Add chicken to wok. (Add additional cooking oil if necessary to prevent sticking.) Cook and stir for 4 to 5 minutes, or until no longer pink. Return vegetables to wok. Stir together salsa and chili powder. Add salsa mixture, corn, and beans to wok. Cook and stir for 1 to 2 minutes.