However, you could use some creative options like:
* A cauldron of soup (especially for thick, hearty soups)
* A brew of soup (for lighter, more broth-like soups)
* A medley of soup (for a soup with many different ingredients)
* A symphony of soup (for a soup with complex flavors)
Ultimately, the best collective noun for soup depends on the context and the type of soup you're describing.