A year or so ago I bought a bulk lot of liquid castille soap that I've been using in our reusable hand soap dispensers, but a few months ago I ran out. I prefer liquid soap for hands as it is easier in the kitchen and bathroom and doesn't leave the same mess as home made olive oil soap bars do with regular use (all that lovely glycerine gloops out). However, with increases in postage (no local suppliers) it just wasn't practical to buy more online, so I went looking for another solution.
I stumbled across this post at The Frugal Berry - in a nutshell you use a bar of Castile soap (say Dr Bronners, but of course you can use home made soap), water, a bag and some time. Seemed far to easy, but nothing venture nothing gained, so I gave it a whirl.
It worked! In a week I went from this
Liquid soap problems solved!