I use active dry yeast and put it in the fridge. I buy the jar and haven't had issues with it not doing its thing, I do proof before I make bread. A jar can last as long as 3 months for me, but usually shorter than that.
I was told one time (ok several times) , when I lived in SC, that there is only one flour for biscuits. White Lily. Seems it is a pretty low protein flour (around 8.2% I believe) and that may have something to do with the end product. I was also told, by those same people, that White Lily isn't good for anything else.