Registration and insurance Used cars for Eastern Europe trip young people – how to save?

Hey you experts, 3 friends and I are planning a 5-week road trip in September across Eastern Europe to Istanbul and back again. For this purpose we would like to buy a car that is to be sold right after the trip (for the car choice there is a separate thread: http://www.motor-talk.de/…/…a-with-5-personen-gesucht-t531656.html); we are now on the verge of buying. Now it is about registration and insurance. To the participants: We are every 20-22 years and we have been How do we get registration and insurance regulated in such a way that we save as much as possible? Should the car be registered on one of us, or should it be registered on one of the parents of a participant or is it possible at all and saves the money? We had thought about a liability insurance, since our car is then already relatively old and not worth so much, right consideration? Of the participants at least 2 people want to define Is there any specific recommendations for insurance or policies that are suitable for our purpose? Surely there are still some questions that I didn’t think about here – I just have little idea how registration/insurance are regulated here. Maybe you can bring light into the dark! Thanks in advance already for your help!