Pop on over to: http://www.pbs.org/parents/crafts-for-kids/cloud-dough-exploration/ to find out what you will need to make it.
'Have you heard of it? Neither had I—and I thought I’d heard of everything kid-art related! A friend introduced me to the recipe, and I knew my three-year-old would love it. The consistency of the dough is lovely to feel and hold. It can be powdery like flour one moment, and mouldable (like damp sand) the next. This brought HOURS of fun to my home, and maybe it’ll do the same for yours!'