A soup BASE is important. Vegetable soup is usually tomato sauce OR chicken broth base. It could be another can of soup.

Hey I tried 'Worst is sure' sauce. Were talking 2 drops here. I even experimented with horseradish.

I make enough soup for ten days so that later incarnations might include meat leftovers. If you're worried about spoilage you can throw in 8 fresh crushed boiled cranberries. They are full of a natural organic preservative called sodium benzoate.