First of all, let's talk about what is a true emergency, and what can wait until the stores open in the morning. Then there are things that are handy to have, but can be substituted with something most of us have on hand anyway. So, true emergency. Shock, wounds, poisoning, egg binding, coccidia (in chicks) . There may be others that I'm not thinking of, but that's what comes to mind. So, shock treat with electrolytes and warmth. Packaged electrolytes are handy, but you can make your own with water, sugar and a pinch of salt. Most of us have that on hand anyway.. Next, wound care. Cleaning, something antibacterial to keep it moist, and something to cover it to keep flies off. Lots of choices for cleaning, betadine and hibiclens are very good, handy for humans and other animals too, but saline (good ole water and salt) works great too. Even plain clean water is ok in a pinch, the point is to flush out dirt and bacteria. Then, to keep the wound moist and kill bacteria, triple antibiotic ointment, great, but honey works too. Non stick pads to cover the wound, yes, buy those and keep handy, vet wrap or elasticon to keep the pads on, so handy for so many things so again yes buy ahead. Next, poisoning. Activated charcoal buy ahead. Next, coccidia, emergency in small chicks, not so much in adults, can't hurt to be cautious and keep Corid handy. Next, egg binding , calcium citrate with vitamin D , if you have laying hens, this is a must have, IMO. Tums in a pinch, but poor substitute. So, my long winded way of getting to my real recommendation for every emergency kit. A notebook, with treatment recommendations, possible substitute that can be found in most homes, and recipes to make those. We all have experienced the mind freeze when in an emergency, notes can be great. Oh and a dog crate. Lots of second hand on offer, when you have time to shop.