I grow pumpkins in my garden and use the seeds to deworm. Pumpkin seeds are a great deworming tool. Plus no threat of anything contaminating the eggs and meat. And many health benefits to eating the seeds. In the fall I harvest the seeds and freeze them. Once a week I feed the seeds to the birds and have had no trouble with tape worms. A few times a year I take some of their poops to the vet to check. But always clean.
When I do its wazine . I use that because the little cap will replace the one on my three gallon waterers .
Also when I do I never see any visible worm sign.
I got a dozen hens all broody right now . All sitting on a nest full of eggs . Perhaps some of you have read my philosophy , simple really .You own the chicken you make the decision 