The previous post by azoria has interesting implications. If I were you, I'd do some research on the general availability, and legality, of the various substances.
Assuming you determine that you will not be breaking laws, I would make reservations here and there, for example a week at x in France, a week at y in Spain, etc. etc., and FedEx packages to yourself as, say, John Smith GUEST at those addresses. I would also specifically in writing (email) explain in short sentences to the concierge (not just the reservations desk) at each location what you will do, request that they hold the package for you, request that they confirm to you by email that they
will hold the package until you arrive, and
get confirmation from them in writing (email) that they will do so.
Good luck with the vits, and have a joyous adventure!
