Nothing. Seriously. There is nothing that will replace a true broad-spectrum preservative. If you do not have one, you should buy one, or you should only be making products that contain no water, otherwise you are risking infection from fungus and bacterial growth.
Remember, vitamin E and rosemary seed extract are in no way broad spectrum preservatives. They are simply antioxidants. A broad spectrum is something like Liquid Optiphen Plus or Phenonip. You can learn a lot about different preservatives from our product pages in details.