Whisker's experiments gave a simple and clear answer to how he could gather Elixir from the sludge.
Since the Elixir didn't evaporate at a temperature where water would, and since it was water-soluble, the easiest thing to do would be to mix a bit of sludge in a lot of water, transfer the water over to an empty container and then boil away the water.
At the end, all that would remain would be Elixir.
He did a small-scale experiment and confirmed that it would work.
Knowing as much, he now needed to make preparations to do that but on a larger scale. The first thing he needed was the apparatus he was going to have to use.
Whisker had 3 cauldrons in his Soul Space, which he decided to use. The cauldrons were full of sludge to begin with, which he simply let float around in his Soul Space.
There were a few other things in his Soul Space, but most of it was quite empty so he wouldn't be affecting anything else.
