This document provides instructions for building a water bottle rocket in 10 steps. It explains the necessary materials which include 2 two-liter bottles, newspaper for ballast, foam tray for fins, and paper for a nose cone. The key parts of the rocket are identified as the nose cone, ballast, fins, and pressure vessel. The 10 steps describe how to cut bottles, add ballast with newspaper, secure bottles together, cut fins from foam trays and attach them, make a paper nose cone, measure parts, and optional decorating. Tips are given such as experimenting with different fin shapes and body lengths for stability.