Wash wild rice, add water, and bring to a boil. Once boiling, loosely cover pot, turn heat to low, and simmer for 45 to 60 minutes. Set aside.
Sauté onions, carrots, and celery in butter. Put cooked wild rice, broth, mushrooms, and cream of soup in pot and cook until heated through. Do not add salt.
If desired, soup may be thinned with water, milk, or cream. Add bacon just before serving.