Put bread slices in a large bowl. Add cold eater to cover. Let bread soak 10 min. Meanwhile, in another large bowl, whisk oil, vinegar, salt, garlic and pepper until well blended. Drain bread and press out excess water. Tear into small pieces and add to the oil and vinegar mixture. Add tomatoes, onions and mozzarella. Toss and mix to coat. Let stand at room temperature for at least 30 min for flavors to blend. Stir in sliced basil just before serving. Garnish with additional basil leaves if desired. Serve right away.