My ducks and chickens all drink out of the same buckets so when I worm one group I worm them all, first with wazine then in 10 days with Epernix Pour on.
I worm call ducks and bantam chickens twice a year with ivermec cattle pour on. Ducks & chickens live together in the winter. Messy, but I dosn't mind changing all heated water pans twice a day. They are so cozy and happy together. This works for me.