That's kind of the beauty of it...it doesn't go bad since it's fermenting like silage in a silo. Course you can contaminate it, but so far I haven't. I feed one scoop a day, and my bucket holds four scoops, I add plain water as it evaporates....at first I wasn't getting a good ferment so I added more vinegar, then it got very pungent for my nose and more so as the weather warmed up, just went back to adding plain water and smells like pickles. And at the end of the day I add another scoop and mix it around. Just smell it, look at it...taste it.
you'll know, I go pretty small, one of those gallon and a half ice cream tubs and a nail bucket...I'm going to go with a second bucket as soon as the next ice cream is eaten and the boys have used all the nails, cause I think it could ferment longer than what I do now. 

