Well you have a few options:
-First would be take a cab. Not free, but the fastest.
-Second would be to take the BW bus to Mk and then either the bus or boat to FW.
-Third would be to walk through Epcot, take the monorail to the TTC and then the Mk monorail and then to FW from there. Not sure if they still do the FW bus direct from the TTC as they have changed the TTC since I used it in 98.
Or you could also go to the Studios ad catch the FW bus there.
I think the best route would be the second. Have fun!