ukhunter:

What are your expected arrival and departure dates?

To hunt waterfowl you will need to purchase a US federal duck stamp good in all states. Additionally, you will need to obtain a Harvest Information Permit (HIP). Additionally, for each state in which you hunt waterfowl, you will need a local state hunting license, possibly a state duck stamp, and possibly a state habitat stamp. Some states may require you to have completed a hunter education course, but perhaps there are ways to waive this requirement for a temporary foreign visitor. Bear in mind that many states offer short-term hunting licenses, for example a 5-day hunting license, that is less expensive than an annual hunting license.

The hunter education course is not necessarily a major hurdle My son and I completed this in a single, all day, 10-hour course and walked out with our huntereducation cards at the end of the day. It may be possible for you to complete a hunter education course on-line.