Why is water so prevalent in these creation myths? What does it say about the societies that created them? What natural elements may have influenced this?

The Greek, Egyptian, and Sumerian Civilizations all based their creation myths around water because it was such an important aspect of their lives. They built their civilization geographically around water. To them it is one of the most important things for life. It makes sense that it should play as major a role in their creation myths as it does in their day to day lives. If water is such an important aspect for life then it is an important aspect for the creation of life too.