if you want bus - just take the boat to WL - and take their bus to Epcot. - the monorail from the CR is easier - you just need to transfer to the Epcot monorail at TTC (next stop)
no MK resorts - CR/BLT, Polyn or GF - has MK or Epcot buses - it is only when there is a MAJOR problem that they get buses to these parks. (when there is a problem with the monorail)
Epcot Resorts - BWV/I, BC/V, YC D&S - doesn't have buses to Epcot or Studios - you can walk or take the boat.