Add 4 cups of water and 4 cups of chicken broth to your soup pot. Whisk in the potato soup mix. Add the diced potatoes, diced onion, crushed garlic and black pepper. Mix well and bring to a boil, being sure to stir every minute or two to keep it from burning. Once warm, serve immediately with toppings of choice. Add a side of toasted sourdough for dipping. Enjoy!