Using Disney Transport, 3 buses would be required:
Bus from POR to a theme park (either DHS or Epcot);
Bus to Pop Century;
Bus to EWWS.
Expect travel time to be between 1 hour and 1:50.
Or you could take a taxi, which would probably take about 15-20 minutes, and cost $10-$15.
If you're attending a major event at EWWS, such as a Run Disney race, cheerleading competition, or major youth sports tournament, transportation may be provided by the event sponsor.