Very sorry for your loss, but don't beat yourself up, I seriously doubt that you had anything to do with his death. :hugs.
Regarding the eggs, go ahead and put them in an incubator, or consider buying some sexed ducklings from a hatchery.
Again, so sorry for your loss. :hugs
How big are the pills? Are they 250 mg? If so, I would give them orally as shown in the videos below.
Maybe I should clarify why I mentioned 250 mg's. It's because IMO they are small enough that they can be given orally, but something like a 375 mg or 500 mg might be too big. @Mrichard0930, if...