1. Cut chicken into cubes.
2. In a small bowl, combine hot sauce, water, sugar substitute, and half the BBQ sauce. Toss chicken in marinade to coat.
3. Cut green peppers and onion into 1-inch squares.
4. Alternate chicken, pepper, and onion squares on skewers.
5. Grill on a barbecue set at medium-high heat OR place in 400°F (200˚C) preheated oven.
6. While cooking, brush the remaining BBQ sauce over skewers.
7. Cook for approximately 10-15 minutes or until chicken is no longer pink.