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.

Actually the ones I knew of used bread as their yeast, because it was what they could get a hold of. They said to make sure not to have any mayo or mustard on it, or it wouldn't work right. lol

The yeast in bread is dead from baking. The fermentation occurs from airborne yeast.