fipronil comes in drops at the pet store, I've bought some at Walmart also, just look for flea and tick in the dog section and look for the active ingredient. There are others also, but I have read Fipronil is the safest (egg-wise) for laying hens.
You can also mix the poultry protector in a bucket and dip the birds up to the neck to completely saturate them. It uses a lot of poultry protector though. I re-use the dip to do several birds with one batch. Also there is flea and tick dog spray you can use, it does the same thing, anything with pyrethrins. I do sprinkle DE or pyrethrin dust (garden dust) in and around the coop and nests everytime I change the bedding. I have not ever had a problem with it making them sick or causing problems. I sprinkle it in their favorite dust bathing holes, and also wood ash from our bonfires, that is supposed to be a good natural deterrent to mites and lice.
Good luck!
You can also mix the poultry protector in a bucket and dip the birds up to the neck to completely saturate them. It uses a lot of poultry protector though. I re-use the dip to do several birds with one batch. Also there is flea and tick dog spray you can use, it does the same thing, anything with pyrethrins. I do sprinkle DE or pyrethrin dust (garden dust) in and around the coop and nests everytime I change the bedding. I have not ever had a problem with it making them sick or causing problems. I sprinkle it in their favorite dust bathing holes, and also wood ash from our bonfires, that is supposed to be a good natural deterrent to mites and lice.
Good luck!