When we stayed there in Oct "99 they did NOT have refillables.
But there is a mini-frig in the room, we had a studio. And we just went up the the grocery store and bought pop, juice and coffee for the coffee maker.
they do - but the refills were not free - they started to change that in December - so I am not sure what plan they are on now - but your best value is to a grocery store and buy cokes there. ask on the DVC site too