"[It's] known as "dry water" because it consists of 95 percent water and yet is a dry powder. Each powder particle contains a water droplet surrounded by modified silica, the stuff that makes up ordinary beach sand. The silica coating prevents the water droplets from combining and turning back into a liquid. The result is a fine powder that can slurp up gases, which chemically combine with the water molecules to form what chemists term a hydrate.
Just... well, do not eat.
"There's also other potential uses for dry water such as jumpstarting chemical reactions and providing a safer way to transport and store harmful industrial materials."