Michael, I have used the alkaline stop for one bottle when I switched to alkaline fixer a while ago. I stopped using it, even though it is a perfectly good (albeit relatively expensive) product, because I became satisfied with water rinses. I use a staining developer for half my processing and a couple of 'regular' developers for the rest and don't miss having a stop bath for film processing. I use 3 water rinses and don't find a problem keeping a jug of a couple of litres of water for this at around 20-22 C: it's what I stand the fixer in anyway.
Cheers, Mark Walker.