Rotifers are pretty easy to keep, the most important thing I think is that you separate them into at least two cultures if you need a constant supply, because you will probably have one crash before you get into the groove of caring for them. (If you do get a crash, don't throw the bottle out, siphon off old water after debris settles, and fill with new water, they will repopulate, but it takes a while)
Go for it I say.