I suspect I have a case of worms to deal with and since I cannot purchase Valbazen in Canada, which from what I have read about Valbazen it seems to treat for most species of worms found in chickens, I am being forced to buy Safe-Guard as an alternative; my question is, can the Safe-Guard be added directly to the water ? If so, at what dosage ? How long do I leave it in the water and how many doses are required ? Also, is there a withdrawal period when it comes to eating their eggs ?