I have spun in Greece. Go to small mom and pop hardware type stores, I forget what they call them. Ask for Parrafina or Kerosina (spanish, but they usually understand- actually, most understand english as they are all trained in school), I dont know the name in Greek, nor could I actually wright it out here. Its never really pre-packaged so they will pour it into an empty water jug for you. You may want to look into finding a better less leakable container. Or, you could look into any juggling supply stores in Athens who ususlly sell "Fire Water" a good fuel but very expensive, like 10 bucks a gallon, comes in a great heavy duty no leak container though. The greeks use parrafin for lamps in their homes so it should be readily available, a bit off of the beaten path, which in Athens could become an adventure. You could even check for white gas in camping stores, however, less available then the kero or parrafin because Athens is crazy urban and there really isnt any camping. those are your best bet. Good luck in Athens, Have a great time and make sure the cabbie's turn on the meter and dont drive you around in circles.

I haven't spun fire in Greece, BUT... there's a great guide to fuels in different languages originally intended for campers/backpackers. Says there that you can get Parafinh, aka Kerosine (US) or Parafin (UK). It may not have exactly the same characteristics as what you're used to back home, though, so do a bit of testing first.

Here's the handy link for travellers:
members.iinet.net.au/~mbuckl...ex.shtml