Nice thing about the 2 litre bottles is the little depressions in the bottom where the yeast settles. After a couple days in the fridge the yeast gets pretty compacted down there and I dont worry about it getting stirred up, of coarse I can see with kids it might be a different story. I like to try different yeasts with my rootbeers, all the different ale yeasts and Champagne yeasts, wine yeasts. So far the best I have found, personal taste, is Nottingham, with Coopers a close 2nd. I am off carbonated sodas for awhile, dieting, I am down to 220 from 250 since June. Another 20-30 to go and I will be back onto my rootbeer, maybe with a sugar sub.