Water conducts electricity well.
Metal conducts electricity well.
This is only sort-of true. Let's assume that the tub is not metal. If you are in water and the water is isolated, then you and the water are isolated. If the tub has metal feet, but these are not connected to the water in the tub, then see previous paragraph. If the water is connected to the metal feet, but the feet are isolated electrically, then again, see previous answer.