I've done this and it worked well. Once the contents of the keg are cold you can speed up the carbonation by shaking the keg. Set the Co2 regulator to the level you want then roll and shake the keg until it stops accepting the Co2.
It's much simpler if you just add bread yeast to the original plastic juice jug for a few hours (always 80 degrees here) enough to bulge the jug but not enough to create noticeable alcohol. Then I fridge a few hours before opening it. Sublime, altho maybe better with 20% water.But I'm looking for something more "natural" without much water. Making a real sparkling juice (around 15-20% water).
I do this with apple juice. The kids love it. I bought a carbonator cap and will fill up a 2L bottle with the juice and get it pretty chill.
I'll hit it with 30psi and have the kids shake it for a minute or 2. Voila -- tasty.
Also I found that if i take unsweetened apple juice (99 cents at wal-mart) then add a half cup of sugar and hit it with carbonation it comes out tasking slightly like martinelli's at a price that is considerably less expensive.
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