The other day I discovered that one of the local dairies sells their milk in 1/2 gallon glass jugs. This thing just got a whole lot easier. I pour off 4/5 of the kefir from the day before, toss the grains back in, and top off with fresh milk. If the current experiment with skim milk succeeds, my diet's going to see a lot more calcium in it.
I'm also "ripening" a batch seperately for a few days to see how that works out.
I don't know if this agrees with the published information or not, but I've been constantly increasing the amount of milk in each batch and I've found that not only are the grains keeping up, but they're growing far more quickly than I'd thought. I've read that cultures in general tend to grow more quickly and remain healthier when they're getting a constant workout. (Which, to them, basically means a 24/7 buffet.) I grossly overloaded them on one batch, going from a cup or two of milk right up to a quart, but they still got the job done...it just took them an extra day. Interestingly, the batch right after that - another quart - took only a single day.
I brought some in to work today for opinions. Several people were too afraid to try it, a few more thought it was okay, two enjoyed it, and one thought it just tasted like sour milk. I guess it's an aquired taste.