Combine 1/2 cup water and bread in a small bowl; let stand 5 minutes.
Place bell pepper, cucumber, onion, 3 tablespoons oil, vinegar, garlic, and yellow tomato in a blender; process until smooth. Add bread mixture and salt to blender; process 1 minute. Cover and refrigerate at least 30 minutes. Place 1 cup soup in each of 6 bowls. Top evenly with remaining 1 1/2 teaspoons oil and red tomatoes.
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