Becky, good question! The answer is Yes, water can be used as the base for soups however on its own, the flavor will be well, watery. To get past this issue, build your soup with lots of flavorful veggies, herbs and spices. Sauteing the vegetables first will also add additional flavor. By doing this you are essentially making a flavorful broth and soup at the same time.
~ Chef Jack Silberstein of “Jack’s Gourmet”