Read the script and make a breakdown of the props you need to make. List the actual props you need and the quantity of each one. If necessary, this list must also include extra prop pieces even for a single prop that should appear in the movie. For instance, if you're using a glass prop for a scene that involves breaking or throwing it, ensuring you have at least five spare pieces is essential so you can shoot more than one take of the scene.
Look for tools and raw materials that you can use from your house's stock room or any part of the house that may have what you need. Check your breakdown list as a guide. Some of the basic ones you can get include tools like a hammer, screwdriver, scissors, cutter, saw, pens, glue and paintbrush, containers like plastic bottles, glasses and vases, and painting palette and raw materials like used paint, varnish, magazines and newspapers and plastics.
Look for actual props or materials that just need enhancements to finalize the horror movie props you need. Examples of these include old dolls, knives, clothes, shoes and leather materials.
Prepare at least one container filled with corn syrup.
Add an initial teaspoon of red food color to the corn syrup, then stir. Add more food color, if needed. The amount of coloring you add mainly depends on the amount of corn syrup you have in the container. As a general guide, since food colors may vary on how deep the color gets when combined with the corn syrup, you must gauge the color and quality of the blood visually. From a light and pinkish color, adding more red coloring will soon result in a deep red color. Add a minimal amount of blue or green food color if you need to give the blood effect a darker and more realistic look.
Add flour and water to control the blood's thickness and texture. If necessary, use more than one container and add different parts of flour and water for each container. This way, you have variations of thickness and texture for your blood effects based on the more specific needs of your movie.
Cut a blade template of the weapon you need. A knife is a popularly used horror movie prop that you can easily make using items in the home.
Attach a wooden or metallic material to your knife's base. Alternatively, you can simply use an actual knife's base by first removing the real blade from it or you can use a plastic toy knife as your base.
Cover the prop knife's blade with a metallic silver material, then paint your knife's base to make it look more authentic, if necessary. Often times, you don't need to do so if you are already using an actual knife's base. If you are filming a wide shot, this type of prop can readily look real already. If you are filming a tight shot, fast movements may allow this to work like a real knife as well. For static shots, you may use an identical-looking real knife first, then use the fake one during the action shots that involve dynamic movements.