As you cut the tomatoes, remove some of the seeds and liquid. Your panzanella will be juicy enough. Leave the crusts on the bread chunks; they will stay chewier and give the panzanella more substance.
* If you don't have hard old bread sitting around, you can take fresh crusty bread, cut it into big cubes, lay the cubes out on a baking sheet, and put in a 150°C oven for 5-10 minutes, until the outer edges have dried out a bit (not toasted, just dried). If you use fresh bread without doing this, the bread may disintegrate into mush in the salad.
Mix everything together and let marinate, covered, at room temperature for at least 30 minutes, up to 12 hours. Do not refrigerate or you will destroy the texture of the tomatoes.
Serve at room temperature.