1.
Monorail, water taxi or ferry from TTC to Magic Kingdom
2.
TTC to monorail or bus from POLY to Epcot
3. Monorail from Epcot to
TTC (depending on time) or get on bus from Epcot towards the Grand Floridian which is the same bus stop as POLY to Park Fare.
4. From Park Fare to POLY you could
walk (lovely 10-15 minute), take
monorail (loop) or water taxi.
You would go out the second floor door of the GCH to the monorail, you will see it. The water taxi is past the marina, you will see the walkway going towards Seven Seas Lagoon take it to get on the water taxi, it will take you to Magic kingdom and Grand Floridian. The TTC is about a 7-10 minute walk and there you can load a Ferry to get you to Magic Kingdom or buses to parks or monorail to Epcot!

Hope this helps, I was very sleepy when I wrote this, sorry if its confusing...