It's easy to make a homemade fire extinguisher using kitchen materials. One common type of fire extinguisher uses carbon dioxide to starve the fire of oxygen. You can generate this gas from any of several chemical reactions and make a simple unit to disperse the gas. This makes a great science project! Kick it up a notch by applying the Ideal Gas Law to maximize the distance you can spray the CO2. You can manipulate the volume of the container, temperature of the ingredients or amount of gas that is produced in order to change the characteristics of the fire extinguisher.