I think ron paul was aware of such things and said it would be a gradual shift. It would be unwise to simply remove the fed cold turkey and cut half the government.
However, as far as researching everything goes, I think the belief is that companies to serve such a purpose would form naturally by intrinsic human nature. A libertarian government operates under the same reason we trust wikipedia to be correct. Government aid would be replaced by larger more powerful fundraisers (especially as there is more money for such a thing, and our taxes would be voluntary to support such measures).
Our dependency on government would be replaced by a dependency on intrinsic motivation. Review companies would pop up and be in competition with one another. So essentially, for those unwilling to do research, someone would still be there to tell you what cereal to eat and what meats to avoid.