Yes, SSR has refillable mugs and 2 locations to fill them.
There is a self serve station next to the pool bar that keeps the same hours as the pool bar. Only cold drinks are dispensed from that unit.
And there is a location inside Artist Palette, again, self serve that keeps the same hours as AP. You can get coffee and cocoa and hot water there.
We used the SSR mugs in January and my Ds's spent alot of time at Community Hall, so they used the Pool bar to refill.