Have a wonderful trip!! I am glad you came out of lurkdom on this thread! It's not only about answering questions as you may have noticed!!

But lots of friendly chatter!
Torsie, Mara is actually next to the pool, it has a cute outside seating area:
But you could easily cary your tray just a few yards further to the tables by the pool bar.
Also, you can take the tray from Mara up to your room and eat on the balcony. Housekeeping will take the tray with them, when they clean the room. We did that every morning:
We've done this too-DH went down with DD and brought back breakfast and I was able to leverage the time to get done with DS...It's really nice being able to breakfast and have coffee from your balcony...

...Nice photos...(I think the seating outside of Mara really pleasant also...

)
Hope you don't get any flooding or so!

Regarding coffee: yes, you need filters, they only provide the pod coffee as you assumed. If I remember correctly, there were actually two black mugs provided with the coffee maker, so you don't necessarily buy mugs at Zawadi. Unfortunately Mara does not sell any special coffee, only the usual Disney stuff.