Not sure if this is the right thread to drop this but I hit upon a website that sells flavorings for the confectionery trade. They have hundreds of flavors at around £8 for 100mls. I bought a Gin and promptly put in 15 mils. POW! way too much - had to dilute my 750 mil bottle with 3 others. I settled on 5mls per 750ml bottle. Which means my £8 investment will make 20 bottles.
Since then Ive also tried Pink Gin, Scotch Whiskey and Bacardi. All but the whiskey are good.
I also got some Smoke flavoring from them which I only need 2 drops per bottle. I use this with the whisky which makes it more bourbon like.
All the flavorings are colorless so for the Whisky / Bourbon I add a little red and green natural food coloring powder until it looks the right shade of brown.
They are also available on Amazon sold by Cupcake World.
http://www.cupcake-world.co.uk/