Foaming Handsoap

I received this foaming handsoap for a gift last Christmas, and when it ran out I was going to throw the bottle away.

Then I decided to experiment, because I wondered if possibly it was the container, and not the ingredients of the soap, that made it foam.

So I filled the bottle with half generic liquid handsoap, and half water. Hooray! It foams just as well as the original did. Now I have foamy soap all the time, and I don't have to buy it at Bath and Body Works!