As children explore the properties of water, they build a foundational knowledge of a material that is important in all the areas of science. This chapter focuses on activities of water play that is so common in early childhood programs, such as in the bathroom sink, in a rain shower, at snack time, or while watering plants. Chapters 1 and 2 are also included in this book selection. Chapter 1 focuses on science inquiry and the use of “The Early Years” column to support science and engineering learning. Chapter 2 focuses on assessment and the value of assessing children’s learning to understand how to make teaching more effective. It has an example of an assessment tool showing sequences of children’s science behavior in early childhood, with related scientific and engineering practices. A materials list, teacher background information, references, assessment, and outcomes are provided. Also included in the book selection are the Table of Contents, Acknowledgments, Introduction, A Word About Safety, and Index.