I printed off the deposit slips from the website indicated on the checklist, and made payments with them last week. There are 3 copies of the deposit slip that the teller has to stamp, and they keep the 1 copy ("1 - "Branch") and I have the other 2 stamped copies ("2 - U.S. Consulate" and "3 - U.S. Consulate") in my briefcase for the interview next month.
Unless you deal with the Scotiabank, you still have to have the CDN equivalent cash to deposit to the US Treasury account. I went up to the teller, she told me that she needed the cash, and that (in my case as there are 3 of us) she needed $324.xx (I can't remember the exact amount) to make $300.00USD. I went to their bank machine and withdrew the cash (and ate the service charge!) and went back to the wicket they held for me until I got back. Then I was watching closely making sure the teller stamped all 3 copies of all 3 deposit slips. All in all, a painless process. There is no option for debit or credit, though. Like I mentioned before, it's probably easier for those that deal with Scotiabank on a regular basis as they can just transfer funds through a teller.
Just a point to note, for every person you will need to print the full PDF document of the deposit slips. So, in other words, to use my case, I had to print 3 copies of these 3 pages.
Here's the site the checklist pointed me to:
http://amcits.com/deposit.pdfScott.