i love the grolsch style flipper bottles. they cost a little more, but they are larger (16 oz. compared to twelve) so you don't have to use as many (about 40 per batch compared to sixty) and they are so easy to use. you can also use 750 ml champagne bottles because these hold about a quart of liquid so you only need about two dozen per batch. they can be capped just like a beer bottle just be careful because european bottles use a larger cap and standard bottle caps won't fit on them. i learned this the hard way and lost half a batch late one night. if you choose to go the grolsch way, the bottles only cost about 50 cents more full than empty, so if you have time, find a store that sells grolsch and enjoy a few cold ones in order to build your bottle supply. over the past several months i've accumulated over seventy bottles and plenty of good times in this fashion.