Well, to be honest, making a run from Bastok - Windurst would likely cost you your life. I am in no way saying it is impossible, but there is a definate risk involved.
The route you would have to take (to survive) looks like this:
Gustaburg
Konschtat Highlands
Valkurm Dunes
Selbina (boat from here to next zone, 100g)
Mhaura
Buburimu Peninsula
Tahrongi Canyon
Sarutabaruta
I would strongly advise you to just use the AH, or find some willing soul already in Windurst to purchase it for you and send it to you. I've done this many times for people, so I'm sure you can find someone on your server.
I just really don't recomend that far of a journey for 1 item. ^^