I have 6 TAD bottles and about 24 extra caps. You definitely want to stand them upright when naturally carbonating. If the TAD caps fit these Coors and Miller bottles, you should get some extra since the liner inside does not hold up to too many re-uses. The good news is, I have a TAD bottle that was filled last November and the beer is still good. Once you remove the storage cap and then add the tap, it has to be consumed pretty quickly. This fall when I start brewing again, I will bottle half of each batch and "keg" half in TAD bottles. I'm also going to buy some Nitrogen cartridges.