I usually just lay out a towel and lay my caps upside down on this and spritz with starsan before starting to fill the bottles. Then my lovely assistant grabs the bottles from me, shakes the excessive starsan from the cap and places it on the bottle and caps it.
I've also just put the caps in a small container of starsan and pulled them out as needed.
Or, if the bag was unopened, I've just pulled the caps out of the bag and used them...