Best to store it in the fridge if its dry blue. If you decapsulate your own, it is no longer 'dry' and needs to be kept in a saturated salt solution, which can be kept wherever.
I just use normal BS eggs, and hatch them out as you usually would. I think its better to use live food than 'dead' food. I am wanting to decapsulate a small amount myself though, so i can use it when i need to (ie when the air pump on my bottle turns itself off (happens occasionally) or when i go away for 3 or 4 days and i cant put a bottle on before i leave, i can have something to feed them as soon as i get back, not having to wait another 24 hours for food. I have alot of hungry mouths to feed (killies + fry galore!) so i always have BBS hatching