No, I would not use acv on chicks, especially if they have blood in droppings.
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I wouldn't say they were skittish. If anything they seemed pompous, the first one said "hah, no I don't do chickens". If the quick chick doesn't seem to have any effect I think I might just go and pick up some antibiotics anyway. I really don't want my first experience farming to be losing an entire flock.ACV won't cure anything. It's a nutritional supplement.
All vets that do fecal floats for cows, horses, dogs and cats can do a fecal float for chickens. Poop is poop, and fecal floats all detect parasites in the poop or will be negative. Assure your skittish vet that they do not need to see any of your chickens or come up with any sort of treatment plan. All you need from them is to run the floatation on the poop and give you the results. You will take full responsibility for treatment. It shouldn't cost much more than $20.