You can buy these tickets at newspaper stands and the ticket offices which usually can be found at the entrances of subway stations. When boarding the vehicles or entering the subway stations you must validate a ticket. If you drive only automatic American models you should be prepared to pay much more. Try Budget at the airport. Drivers in Hungary are not permitted to drink alcoholic beverages at all.
Fines are high and checks are frequent.
All seat-belts in the car should be used and lights should be on out of city limits even during daylight. There is an IC train roughly each three hours. More detailed information for trains will be sent to registered participants and will be put on the web page by the end of May. This may be rather more awkward than you expect. So, when you arrive at the Station by the Airport Minibus or by taxi please ask the driver how to get to the ticket offices from the point he where drops you.