Funny thing is....
All the bottles say "Single Malt Scotch Whisky"
and the books I have on the subject say "Scotch Whisky". These Scottish authors take great pains to explain that the person is a Scots, anything made in or from Scotland is Scottish, but the whisky is spelled without the "e" and is referred to as Scotch.
To quote one author (a Scotsman), "The Scotsman wears a Scottish kilt whilst he drinks a dram of Scotch."
Lastly... From the Oxford Advanced Learners Dictionary :
Scottish / Scots / Scotch / Scot
>>The adjective Scottish is the most general word used to describe the people and things of Scotland, while Scots is only used to describe its people, its law and especially it language: Scottish dancing; the new Scottish parliament; a well-known Scots poet; a slight Scots accent.
>>The adjective Scotch is now mainly used in fixed expressions such as Scotch whisky and Scotch broth and sounds old-fashioned or insulting if it is used in any other way.
>>The noun Scotch means whisky, and the noun Scots refers to a language spoken in Scotland, closely related to English. A person who comes from Scotland is a Scot: The Scots won their match against England.