From the pictures on the website, it looks like what you get for $4.99 is a cheap squirtgun and a tube of reactant.
All you need to do is buy a couple of these (since the minimum order is two) and a super-soaker, throw away the cheap squirtgun, and put the water and the reactant in the super-soaker. (Of course, you will need to increase the amount of reactant in proportion to the volume of the super-soaker vs the volume of the cheap squirtgun!)
Slashdot Mirror
From the pictures on the website, it looks like what you get for $4.99 is a cheap squirtgun and a tube of reactant.
All you need to do is buy a couple of these (since the minimum order is two) and a super-soaker, throw away the cheap squirtgun, and put the water and the reactant in the super-soaker. (Of course, you will need to increase the amount of reactant in proportion to the volume of the super-soaker vs the volume of the cheap squirtgun!)