You can use Epernix pour on it is used like front line for dogs and is safe it will also kill internal parasites. all but round worms. I have used it but you'll need to keep him out of the water over night, like treat him before bedtime then put him up so he can't get into water till 12 -24 hrs can't remember that part but if you can keep him out of the water long enough it will kill the lice/mites. LF chicken get 7 drops on the skin at neck and 1 drop under each wing. so that's for a 7-10 lb bird. I used it on my water fowl one year in Jan since that was when they wouldn't have any bathing water and I used 12 drops on my ganders neck .
Where can you get Epernix? Is it an online order product? I would also like to get some.