1. Buy the dispensers and use as normal
2. When they run out of soap refill with 2 tbsp hand soap (buy a kind that you like that smells good) and water (enough to fill the bottle almost to the top but not quite). Be careful while filling with water not to agitate too much so you don't end up with an avalanche of bubbles.
3. Put the lid back on and shake.
And you are set. And yes-it really does work. I was skeptical myself but have the evidence sitting right by my kitchen sink.
I'm beginning to feel more frugal already.