Then use your hands to squeeze the bread dry. Stir the soaked, squeezed-out bread, and 4 cups cold water to the tomatoes in the pot. Let it bubble up and cook gently for another 20 minutes, then stir in the onion or leeks and their cooking oil along with the shrimp, the sliced chouriço, if using, and the anchovies, if using (the anchovies really accentuate the seafood flavor)