My story is set in 17th century Ireland and some people are drinking whisky. Now the original spelling is "whisky" although the Irish added an "e" (whiskey) in the 19th century to differentiate their drink from other types. What spelling do you think I should use for my story? Surely it would be anachronistic to use the "e" spelling? Or, seeing as this story is being told now, should I use the modern spelling?