Once upon a time it was (cheap) scotch and coke, bundaberg rum and coke (turns out 'sweet') or just about any of the relatively cheap 'brown' spirits with coke.
These days I don't drink often enough for it to really matter, a 750ml bottle of <insert spirit> will last for years.
Currently I have a bottle of Smirnoff Vodka sitting in my cupboard and I can't think of when I actually bought it.
It's good for medicinal use, a capfull seems to be pretty effective vs toothache, but it tastes terrible to me right now.
