Is it just me, or are the instructions on animal antibiotics just clear as mud? I'm a nurse and I have to mix meds regularly, but I have no idea what to do with this. I have Terramycin Soluble Powder. The packet contains 10 grams of the antibiotic, in 6.4 oz. The dosage says 400-800mg/gal. Does anyone know how much powder to mix with how much water? I don't want to do the whole packet at once, as the instructions say to mix it fresh. Help!