Clean out a container that a small submersible pump will fit into. Inspect the container to make sure it is free of holes and cracks that would prevent it from holding water.
Place the submersible pump into the bottom of the container with the pump's cord running up and over the side of the container. Set the container in a location where the pump's cord will reach an electrical outlet.
Cover the pump with water by filling the container ¾ full with water. Set a small flat rock in the bottom of the container to raise the pump up if needed.
Turn the submersible pump on by plugging it into an electrical outlet. Adjust the pump's fountain head to acquire the effect you want.
Set small aquatic plants, rocks or statues in your fountain to make it more interesting.