From what I recall, the bacteria need to be fed 4-hydroxyindole, serine and methionine to do this. The last two are easily available, 4-OH indole much less so. Fed with normal faeces they might still produce DMT though, from the indole content. There's a more thorough discussion of this paper in the main part of the forum.
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli