I found this morning that my birds have worms. Quite a surprise for me since I keep plenty of DE in their feed. Anyway, I've been reading the posts on worming and see that Eprinex is good, but I don't have any. What I do have is ivermectin injectable that we bought when a man we bought a dog from said he gives it by mouth to prevent worms/heartworms. We no longer have the dog but I still have the Ivermectin. Can I give this to the birds? In their water or by beak?