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Tylan water soluable powder dosage is 1 teaspoonful per 5 gallons of water. Cut in half it's 1/2 teaspoonful per 2.5 gallons of water. Chickens should be treated for 3 days; however, treatment may be administered for 1 to 5 days depending on severity of infection. If you wish to break the dosage down further, go ahead. I recommend use mix the 1/2 teaspoon into the 2.5 gallons of water and take what you need from that and provide it for your single chicken. You can put it in her water container to drink.