Bought a package of corrid, just in case, 4 years ago....never needed it.
Have some Chik Saver(vitamins and electrolytes).... have used it during heat wave.
Permethrin powder and liquid for external parasites...have used it for lice.
Have some vetricyn for wounds.
If a bird does get sicker than those things can treat, they get euthanized.
I won't use antibiotics and the DIY herby stuff is mostly snake oil.
Have some fold-able wire dog crates(24"L x 18"W x 21"H ) with 1x2 wire in the bottoms,
(tray can used
under crate for cleaner feet and easier observation of feces or inside of it)
for isolation, have used those several times for a hurt leg or observations of ailing bird.
Yes I also have a small dog crate I usually use it when one of my hens go broody. I place it a little off the floor on blocks to allow airflow and it snaps them out of it in a couple of days. Thank you for replying.