In the medium bowl, stir together the lime juice, orange juice, tequila, cilantro, garlic, salt, and pepper. Put the chicken breasts into the freezer bags, 3 per bag, and pour the marinade over the chicken. Turn the bags over a couple times, then put them in the refrigerator for up to 12 hours. Preheat the grill to medium heat, and brush the grill rack with oil. Grill the chicken 10 minutes on the first side, then turn and cook another 8 minutes. Slice the chicken diagonally across the grain and serve with the fajita accompaniments.
