Making soup is easy. You can use pretty much anything that is in the kitchen already. All you have to know is the "101's" of soup-making . 

• Protein: Leftover meat is a great option. If the meat is raw, cook it partially ahead of time to seal in the flavor. Beans are always a good plant-based option. They add flavor and have protein, and fiber. Use them dried or canned. 
• Vegetables: Start with the basics: sauté chopped onions, celery, and carrots in a tablespoon of olive oil until tender. You can add to this chopped garlic, peppers, or any other vegetables before you add in the broth. If you have leafy greens, add them during the last 10 minutes so they don't overcook and lose their flavor. 
• Soup Broth: This is the base of your soup. There's nothing wrong with using the canned variety. It doesn't matter if it's chicken, beef or vegetable stock. If you're watching your salt use the low-salt variety. However, it's easy enough to make your own vegetable stock. Take whatever vegetables you have, This can be what's left after you cut up vegetables to cook, toss them in a pot of water with some seasonings and let simmer for 1 hour. After it's cooled, freeze it in a container. This can be kept for up to 3 months and is ready for the next soup!