Trim the fat off the chicken breasts and slice them in 1/2 inch thick by 3 inch long slices.
In a zip-top bag, add the oil, lime juice, fajita seasoning, and salt and massage the bag to mix well.
Add the chicken to the bag, let most of the air out, and seal the bag. Massage the chicken to completely coat it with the marinade. set aside on the counter.
In a medium to large skillet, heat the oil over medium-high heat.
Add the bell peppers and onions and season with salt & pepper.
Cook until they are slightly softened and add the water and fajita seasoning. Stir to mix well.
Reduce the heat to low and let the water cook off. Remove the vegetables to a plate and tent with a piece of aluminum foil.
Remove the chicken from the bag and place in the same pan used for the vegetables. Add 1 tablespoon of fajita seasoning.
Be sure to cook the chicken completely, about 5 minutes.
While the chicken is cooking, place the tortillas on a microwave safe plate. Place 1 or 2 damp paper towels over them and microwave to 1 minute.
Place a few slices of chicken and some of the cooked vegetables on the tortillas.
Use your choice of toppings from the list above.