Here's a picture of a new room, from lynr's thread. It looks like they've kept the same coffee maker and coffee packets/sugars/powdered creamer:
But if you get the old room decor, here's where the coffee maker and accessories would be:
So to answer your question: Yes, the rooms at the Polynesian have coffee makers We did not try the coffee that was in the room, so I don't know how good it would taste. Maybe someone else will come along and give their opinion, but at least you'll know that a coffee maker will already be in the room. Hope this helps
Coffee was drinkable. Using bottled water would have been optimal as Florida water will kill even the best coffee. If you just want your caffeine jolt, it's fine.