Hitched a lift with a flying petrol tanker, obviously.
The refuelling planes have normal fuel tanks, no extra fuel than they'd have normally. They are pretty standard A330 planes, can carry 290 or so passengers. There are modifications, of course, and the fuel can be used for refuelling and/or flying. We were up for about 6 hours, and the pilots were being assessed by a trainer.
It was quite an experience.