its shelf life in the fridge is 14 days, after that, the manufacturer says to discard the formula, although even though it's getting weaker, u can still use it up to maybe a month.
Yeah my powder came with BAC water, seperate vials ofcourse. I break the top off the powder and water, at the water to the powder then extract with a syringe and put it into a sealed 10cc bottle for storage in the fridage.