I know it sounds ridiculous, but it is possible to make eggnog entirely from food storage!
We have found that some people may not always keep vanilla and nutmeg on hand. If you have it, great, use it. If not, this recipe shows you how to substitute Cinnamon for nutmeg, and use Brown Sugar instead of white sugar and vanilla extract.
The thing that I really loved about making this was using the Mixer Pitcher. While it certainly isn't required, it makes this and many other jobs a whole lot easier.