Roughly chop the tomatoes, cucumber, bell pepper, onion, and garlic.
Soak the bread in water for about 5 minutes, then gently squeeze out the excess water.
Add the vegetables, bread, vinegar, olive oil, salt, and pepper to a blender.
Blend until completely smooth.
Taste and adjust the seasoning. Add more salt, vinegar, or olive oil until the flavors are balanced.
If the soup is thicker than you'd like, blend in a little cold water.
Optional: If possible chill for at least one hour before serving.