IMHO, that seems like a bad idea. Two thoughts (these are only very overly generalized opinions, biology is a little bit complicated): 1) You might not get the

IMHO, that seems like a bad idea. Two thoughts (these are only very overly generalized opinions, biology is a little bit complicated): 1) You might not get them all, and the ones that survive might transfer the traits of antibiotic survival and pathogenic-ability (if present) to the new population. 2) You would need to ensure that your hyper-specific diet contains the right mixture of microbes, say, you would need to avoid irradiated food, and a bunch of other things. "Bad microbes" coming into an empty gut seems to me like a bad thing.