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What are you talking about with shipping? I'm confused.

Because you can't control how much water each chick drinks and you won't know how much medicine they are taking in.

No it should not be fed in their water. You need to direct dose each bird straight to the beak no less than twice a day with it. Three times is better. Dose here: https://www.backyardchickens.com/threads/treating-and-preventing-diseases-with-tylan-200.1241683/#post-19926142

I am sorry but this concoction will not work. You will need real antibiotics.

Your state lab is listed here. NECROPSY & DISEASE TESTING LABS You can have testing done, usually just a swab taken by you and sent (mailed) in, to know what your are dealing with.

Almost all chicken diseases are spread extremely easy so if one in your flock shows symptoms then it is extremely likely they all have it/have been exposed and are carriers already.

Can you take a few pictures of the sick birds?

I am so sorry. MG is a pretty common and it might be what you are dealing with. What state are you in?