Fresh wort kits are on sale at most homebrew stores here in Aus not sure about overseas HBS. So my understanding is their made using exactly the same technique as Mark just rack in your boiling wort into sanitatized cube bung lid on invert cube (my way of sterilising lid) let it cool and use as needed.
I take my hat off to the cubing dudes I had some very tasty cubed ales on the few I did. Water ain't an issue on the coast and I've got a healthy veggie patch that loves when I brew and chill with Imersion chiller
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But
@Mark D Pirate i hear that SA is getting a price hike in electricity I hear it's going to be highest priced electricity in the WORLD!