Grilled Chicken Bread Salad

Name: Grilled Chicken Bread Salad
Ingredients: 3/4 of a loaf of day-old crusty, rustic bread, cut into 1-inch thick slices; 2 large tomatoes (about 1 pound), trimmed and cut in half; 1 large red bell pepper, halved and seeds removed; 1 large green bell pepper, halved and seeded; 1 large red onion, sliced into large rings; 1/4 cup extra-virgin olive oil; 1/4 cup red-wine vinegar; 3 tablespoons water or vegetable stock; 1 tablespoon capers, rinsed; 4 4 oz. boneless, skinless chicken breasts; 1/2 bunch fresh basil leaves, shredded (about 1/4 cup); freshly cracked black pepper and kosher salt, to taste