Bittles Bar (near to Kitchen Bar) has a selection of bottled beers, nothing that wow maybe.
For whiskey the best is the Duke of York, loads of whiskey history here in mirrors, adverts, old bottles etc. as well as a very good Irish whiskey selection.
BTW - Molly's Yard is a restaraunt and you pretty much need to be eating to get a beer, the foods good so what better excuse!