Unfortunately, such a low cost gruel will not keep the biological components of a Servoskull (nor the inferior biological meat of a Guardsmen or similar) functioning long term. We must supplement it with various other substances the body is not able to make on its own.
As well, a ServoSkull cannot swallow a pill, lacking all of the organs necessary to do that.
As we can see here, my loyal ServoSkull is uninterested.
Notably, we need to add:
Salt:
https://www.amazon.com/dp/B001GHYO4E?tag=19-72342-20Needed to keep nerves and neurons firing, and muscles in humanoids who have not yet embraced the Omnissiah
Potassium Chloride:
https://www.amazon.com/dp/B00ENS39XK?tag=19-72342-20Essentially a more metallic tasting salt, and therefore closer to the metal we all wish to embraced
Also needed for nerves, neurons, and muscles
Lysine:
https://www.amazon.com/dp/B00ENP215K?tag=19-72342-20Biological forms need this protein to self repair
Several bionics exist to provide this protein on demand, but non-believers shun this due to the small reduction in cognition it causes
Choline Bitartrate
https://www.amazon.com/dp/B00EIS9NW6?tag=19-72342-20A precursor to choline, required to keep organic brains from decaying over time
Calcium and Vitamin D:
https://www.amazon.com/dp/B002RL8FBQ?tag=19-72342-20Required as nearly no tech priests go outside with any bare skin exposed, due to the humiliation it would bring
As well, a standard multivitamin is required to supplement all other functionality
A low cost one from the Forge World of Kirkland is provided here:
https://www.amazon.com/dp/B006VRNEFO?tag=19-72342-20And, if any Menial chooses this meal over the standard Emperors Mercy Bars, they may wish to add xanthan gum for flavoring:
https://www.amazon.com/dp/B00CYMU3TA?tag=19-72342-20Use it as a treat to keep their biological components compliant.
https://vocaroo.com/i/s1QlKGuH2QYF 
