Here are the steps to build a mini refrigerator dryer air:

Fill the container or jar about halfway with silica gel desiccant. You can find silica gel at many craft stores or online.

Cut a small piece of mesh or fabric that will fit over the opening of the container or jar. This will prevent the silica gel from falling out of the container.

Place the mesh or fabric over the opening of the container and secure it in place with the lid.

If you have a small fan or air circulation device, place it near the container to help circulate the air.

Place the container inside the refrigerator. The silica gel will absorb any moisture in the air, helping to keep the refrigerator dry and prevent food from spoiling.

It is important to periodically check the silica gel and replace it when it becomes saturated with moisture. You can tell if the silica gel is saturated by its color. When it is dry, silica gel is usually blue or pink. When it becomes saturated, it will turn white or clear.