You can prepare this salad in a large salad bowl or individual bowls. Place the dry and stale bread in a bowl. Have a glass or bowl of water available, using your finger tips sprinkle some water onto the bread cubes. Typically in Tuscan the bread would be very stale and this process will soften it just a bit. Start adding the rest of your ingredients, the tomatoes, cucumber, red onion, tear the basil leaves (not real small, because you want to see the color and get a pop of flavor) and sprinkle around and mozzarella balls. Drizzle the salad with vinegar, then drizzle with olive oil, next season with salt and pepper. 

Its best to let the salad sit for 15 or 30 minutes before serving to let the bread soften a bit and to give the salad nice flavor.