Watch for preservatives in store juices as it will kill yeast.
Chik Fil A sells gallons of lemonade with lots of pulp and no preservatives. Makes a mean Skeeter Pee and a decent champagne also.

Sounds like a good homeschooling science lesson for the boys.

If you use baking yeast, like I'm guessing prisoners do, you had better be willing to spend some time on the toilet.