This is a great article regarding treating a duck with bumblefoot.
https://www.backyardchickens.com/articles/treating-bumble-foot-in-ducks.74245/
Treating bumblefoot takes time and patience. Make sure to pack that hole with neosporin, wrap it, and keep it dry. You might want to reach out to your vet as well. I'd be worried if my duck had an open wound like that and did not have antibiotics to use. I know there are antibiotics that you can pick up at tsc or a local farm store, but I haven't researched to know which ones. There are many threads mentioning them by name.
Please don't use rubbing alcohol in that wound. That would be very painful.