Bringing your own hospital items

So I know the hospital will supply those formula bottles that come with the cheap nipple and formula already mixed in those bottles but could you bring your own thing of formula and bottles? I got a bunch of those formula type things from Enfamil which I would rather use that brand anyways over Similac which is what my hospital uses and I would like to go ahead and start him on the bottles I would be using at home. Has anyone done this before? Would i look crazy? Lol