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If you got that kit, you shouldn't reallly need anything else to prep the surface of the hone.
the norton waterstones don't really need slurry, and you can use the lapping plate included to lap and...

DMT aligner 1x4 interrupted plate. about $15 or so i think...
probably not a heckova lot cheaper than a matched slurry stone, unless you've got multiple different stones to prep.