This is a common chemical, it's used in diapers and women's pads and the powder absorbs many times it's weight in water.
You can get it in various grinds, the finer grind, the better the slime or goop that it makes.
It is also marketed as 'Water Keep' for using in gardens, and you can order it from them here.
http://www.water-keep.com/ Be sure to order the fine grind, unless you want a lumpy mess, kind of like applesauce. The fine grind is best for wam.
It's not very slippery, so to make it slippery and stringy, use a little 'Sticky Yuck' available here
http://www.buckets-o-fun.com/3yucks.html The combination of both products is perfect, you can make it just the right consistency, and stringiness. It's very slippery, so use caution around bathtubs, etc.
Hope this helps. Oh yes, the special dissolving ingredient is common salt.
