Root beer is usually super easy, and carbed up in three-four days. Champagne yeast (about 1/4 of a package in 2L) works great. Keep at room temperature 3-4 days (longer if it's cold) and you have root beer.
I'm not sure what the issue could be here. Temperature and ingredients are the only things that play a role, so if the ingredients dont' have preservatives, just make sure the bottles are at 70 degrees or so, and it should be fine.
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Broken Leg Brewery
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