Thad; this is the third post in a row of yours that I have answered. Don't you have some studying to do??
Yes, you can wash your brass with water. It works even better if you use a 10% solution of citric acid (w/v), as was suggested to me by the NRA about 30 years ago.
Get Ni plated brass. It will stay cleaner. The Rem +P .45 ACP brass is the best on the market. Strong, and a good thick Ni plating.
When your friend tumbles your brass, you should have him throw in a few capfuls of Dillon Brass Polish. This will leave a protective coating on the brass, and also gets it cleaner more quickly.
Now, stop posting, and get studying. Walt