What is the best option to rent a car for two or three months?

How much it will cost depends on size car you get and how long you have it. Three months will be a different charge than a day by day charge. You will need to rent, I don't believe you can lease for three month, but if you can you can be assured the payents will be very high. Check out maybe buying a cheap car and then selling it when no longer needed... don't think it would be but in your case may be cheaper.