What size water bottle do you have for how many chicks? You would be treating them all. Get the liquid Corid. The proportions are two teaspoons of Corid to one gallon of water, or half a teaspoon per quart mixed fresh daily and given for five days. Wait a week after the last dose and do another five days to get any oocytes that hatched.
The photo of the sick chick appears she's quite sick. If you can, call feed stores and buy it today. This chick may not survive if left untreated until a mail order arrives.
The chick would do well with a drench dose in addition to the Corid water. Get an oral syringe and fill it to about .3ml. Give it into her beak on the right side slowly so she can swallow or give it directly into the esophagus like this photo shows. Do it once a day for three days. It cold save her life. This stuff can be bitter. Add a little sugar to encourage the chicks to drink it.
View attachment 3326874