Mix all of the cornstarch and the water together in a bowl. If the mixture is really thick, add some more water. The mixture should be slightly runny.
Now, run your fingers through the Zlime.
Here's what's cool about Zlime. When you poke the Zlime quickly, putting pressure on it, the Zlime particles lock together and it acts like a solid. But when you poke at it slowly, this doesn't happen and the Zlime still acts like a liquid.
You really need to feel the Zlime run through your fingers to understand how it changes. Try it out.