The only routes via ferry from WL are to MK and then a separate line that is between WL, FW and CR. Last I heard, the only route running is the ones from WL to MK and FW to MK directly. There is not, nor has been a ferry to TTC.
If you are set on the monorail to Epcot, then you could add some time to your transit and go via MK. Boat WL to MK, Boat or Monorail MK to TTC, Monorail to Epcot.