Does anyone know how to mix the terramycin with water? I bought a package at the feed store today and the directions are so confusing. How much powder do you mix with water? Even the people at the feed store were confused. Also, a couple of my 4 month old silkies have sneezed occasionally. Do you think I should treat them with terramycin as a precaution or wait until I am sure there is a problem? Thank you so much for help!