The Pot will come with one however it will sit much to high, you can build your own false bottom using a perforated pizza tin and 1" long SS screws for legs. make sure you oxidize your pot & false bottom buy boiling water in it first and NEVER use anything other than soap and water to clean it...
I also got much better efficiency from stirring like hell due to water being to hot...however it's not better conversion but rather scrubbing/removing the sugar's off the grains. The best things in history have come from our mistakes right? Cheers