I love foaming handwash, but it is a bit more expensive, so I usually skip it. Using Beckie's instructions, I patiently waited until my current bottle of foaming wash was empty, and then I turned this 98 cent bottle of hand soap:
into this full bottle of foaming wash, plus enough refills for 5 more times! Just use a 5 parts water to 1 part soap ratio, mix, and store for later use. The foaming handwash that I usually purchase is about $2, so using Beckie's system, I saved about $11! As Beckie points out this means that you can splurge on that bottle of slightly more expensive Bath & Body Works soap and s-t-r-e-t-c-h it out!
P.S. Be sure not to use the soap that has moisturizing beads in it--I think this is because it would clog your pump up.