Two things I suggest keeping on hand when owning a bird.
1) a digital scale that reads in grams.
Birds are very good at hiding being ill. If seen as being ill the flock would remove said bird so whatever it has don't spread to the flock. So they look/act normal almost to the point when they fall over dead before showing any symptoms. So daily or at least weekly weight checks will tell you of issues before the bird ever will. I weigh Phoenix daily just after he drops the big overnight poo.
2) A blood clotting agent of some sort.
Birds have a some blood feathers. With how small they are and how fast the heart rate is normally they can quickly bleed out. If they should break one of these blood feathers or somehow get cut you might have to be ready to help. Can be as simple as some cornstarch or like me buy a first aid kit designed for birds.
And lastly a site much like MFK but for Birds
www.parrotforums.com