From the web...
“Inorganic phosphorus as phosphorus additives are commonly found in foods like processed meats and baked goods as well as beverages like soda, iced teas, bottled coffee drinks, and flavored waters. Examples to look for in the ingredients list are phosphoric acid, dicalcium phosphate, sodium phosphate, and trisodium phosphate. If one is following a low phosphorus diet, it is important to be aware of these “hidden” well-absorbed dietary sources of phosphorus by reading food labels carefully.”
“Calcium fortified” often means calcium phosphate. Look at OJ and milk.