I am SOOOOOO doing this! I never even thought of it, but it sounds delicious! I took a look at their site -- are there any other flavors that work well in coffee for you? Flavored coffee can be so expensive, but doing it this way is not only cheaper, but gives you control on the amount of flavor and the ability to change it up - GENIUS!I haven't, the only capella's brand I know about is the flavoring company, not the ejuice. Now I DO have capella's custard flavoring, but I don't DIY, it goes in my coffee and it IS good!