Magic Trick part 1.-makes water "disappear." The trick is to place a small amount of "Diaper Polymer" into the bottom of an opaque cup, pour in water, and then turn the vessel upside down, showing that the water has disappeared. But, of course, it is still in there in the form of a gel that will not fall out. Magic Trick part 2. – Water "reappear." Now you can add a "magic chemical," which is a bit of salt, and then pour out the water that has wondrously reappeared. Adding the salt means a higher sodium concentration outside the polymer than inside, so water will flow out of the matrix.
After all fun projects, then mix it with soil in plants to retain moisture. Or dispose of the gel in the trash.