Neovet 325 (neomycin) amount per gallon for chickens

[vonchick]

I have a wheezing hen and the feed store sold me Neovet 325 (neomycin). The package does not say how much powder to add per gallon of water - does anyone have experience with this medication, and how much to add to the chickens' drinking water? I use one gallon waterers.

Thank you!