Place the meat and vegetables in large, separate ziploc bags. In a bowl, combine all marinade ingredients and whisk well. Reserve 3-4 tablespoons of marinade for later, then using the remaining marinade, add a splash to the vegetables for a light coating, then add the remaining marinade to the meat. Marinate in the refrigerator for 4-6 hours.
1 lb. chicken and steak, 2-3 red and yellow bell peppers, 1 large onion, 1/4 cup fresh lime juice, 1/3 cup water, 2 Tablespoons vegetable oil, 2 cloves garlic, 3 teaspoons vinegar, 2 teaspoons soy sauce, 1-2 teaspoons liquid smoke, 3/4 teaspoon salt, 1/2 teaspoon chipotle chili powder, 1/2 teaspoon cayenne pepper, 1/4 teaspoon ground black pepper, 1/4 teaspoon onion powder