Water solubility means that a substance dissolves when added to water. Since CBD is oil, it does not blend into water on a molecular level. So technically, it cannot become water-soluble in any way. However, when CBD oil is broken into droplets smaller than a virus, it becomes much more “compatible” with water. This is called a nanoemulsion formation. Thus, water-soluble CBD is technically a nanoemulsion. It is a liquid consisting of water, surfactant (the substance that enables emulsion), and super-small cannabidiol particles.