Oops, meant to post this photo of poop. I didn't watch it come out of her, but she was the only one nearby when it was fresh, so...
What's up with poop that looks like slugs crawling through urate?
Like I said, her condition seemed stable, she was eating and responding, with an empty am crop, but that can't be healthy poop, right?
I would subscribe to that list... do you know anything about copper sulfate?
Glad you will be seeing a vet. Have them run a fecal float to check for Coccidiosis and worms.
There's quite a bit of urates in there, could be she's a little dehydrated. I do see what looks like intestinal shedding as well - could be normal it happens sometimes, but if it's consistent, then worming, treating for Coccidiosis and/or infection may be needed.
As for medications to keep on hand?! A lot depends on where you live and how easy things are to obtain. It's nice to be prepared, but some things you may never use.
You also don't want to prophylatically treat with medication, you really want to have some idea what is going on. Sometimes medications are suggested as a last ditch effort to see if a rapidly declining bird will improve.
Antibiotics and other medications you need to research/read up on those and determine if they are right for you to use - if they have withdrawal periods, if you are allergic to them, etc.
You ask about Acidified Copper Sulfate - you can purchase that through most of the major hatcheries like Meyer, Murray McMurray and others. Jedds also carries it. Acidified Copper Sulfate
can be used to treat sour crop and canker - it's used for a few other things too. You do want to make sure you read labels and follow directions, excess can be toxic. ACS cannot go into metal containers (don't use a metal spoon to stir it!) use glass or plastic (spoons and containers).
Antibiotics can be a little harder to get - you have vet care, so going through your vet is best, but most things can still be ordered online.
Tractor Supply carries some basics as well.