Just one more tip: Try making some Homemade marshmallows from Little Birdie Secrets to give away with your homemade cocoa mix, it'll be a hit!
Not Just For Storing has a great article about reusing containers for food storage. Check it out here.
Totally Ready had an interesting idea to turn off the electricity for a day and see what you really need to do to be prepared for an emergency where you wouldn't have any power. Could make for a fun, family-bonding experience...or something, but better to experience it when you actually have a choice.