I bought some fresh cider (produce section of the grocery store.) The label said "flash pasteurized". I just put a water seal on it and stuck it in the closet with the water heater for a couple of weeks.
Ended up with a sparkling, semi-dry apple drink....like apple champagne.
What is a water seal?
I bought a gallon of cider about 3 weeks ago. Drank most of it, but at one point, I left it on my counter overnight.
When I opened it, it burped at me, and that was what got me thinking about it.
As a yute working on a farm in upstate NY, the farmer I worked for always had a couple 55 gallon drums in the basement of the barn.
Start throwing bales of damp hay and that cider would go through you like water! Yum!