Stir in the chicken broth, water, crushed tomatoes, beans, spinach (does not have to be thawed), oregano, salt, onion powder, garlic powder, black pepper, and red pepper flakes. (Do not add fresh herbs, if using, at this time.) Raise heat and bring soup to a boil. Once the soup is boiling, put the lid on the pot and lower the heat enough to keep the soup at a simmer for about thirty minutes.