A Drop of Water by Gordon Morrison, 2006, Houghton Mifflin (NY).
Do you like to play “I Spy”?  In this book about the water cycle, you can search for over 40 plants and animals. You’ll follow a single drop of water down a stream and through the countryside. You’ll learn about caring for the environment, too.  If you can’t find all the plants and animals, there’s a great, illustrated glossary in the back of the book to help you.  See how many plants and animals you know.

A Drop of Water: A Book of Science and Wonder by Walter Wick, 1997, Scholastic (NY).
You’ll love Walter Wick’s stop-action photography.  It lets you see a single drop of water better than if you were looking through a magnifying glass.  You can also see actual snowflakes and even molecules in motion.  And, if you like to do your own experiments, this book is for you.  It’s full of simple experiments that can be done with supplies you’ll find in your own kitchen.  Get ready to start your own scientific investigation of water.