The basic gist of it is this:
- Get some cans of grape juice from concentrate (that does not contain dyes, preservatives, etc), sugar, water, champagne yeast, container(s), bleach (for sterilizing equipment before use), and balloons.
- Mix the ingredients and pour them into the containers (the guy on the site used gallon-sized water jugs).
- Place balloons over the openings of the jugs (to catch the CO2) and let sit for ~2 weeks.
And voila! Large quantities of extremely crappy wine! I'm sure it tastes awful, but this seems like a fun project. I might try it sometime, when I have plenty of space, and grape juice from concentrate is on sale (otherwise a few $2 wine bottles would be cheaper).
Here's the site: http://www.leftofme.com/how-to-brew-cheap-wine/.
I wonder if it could ever be as gross as boxed wine... :-)