Cook epsom salts in the over at 400F for 3-4 hours (double check on temp and time). It should look greyish when done.
Quickly move to an airtight jar while it cools down, as it will quickly suck up moisture from the air.
Add a good quantity to your acetone jug. Shake vigorously. Let everything settle. Keep lid closed when not in use.
You can strain the epsom salts out when done, but work quick, water in the air will be absorbed quickly. If you have a buchner filter you can fill it with dried epsom salts and run the already dry acetone through that to ensure it remains water free.
Good luck.
Drierite also works wonderfully as well.
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