All of that information should be in your pre-cruise information from Viking. We lhave a September Cruise and received an email from Viking about all things Covid last week.
I have Eddie Bauer pants and shirts that wash and hang dry overnight also. Most sporting goods stores have these types of travel clothing. I highly recommend!
There is absolutely no rhyme or reason to how Viking is handling the testing! They need to get their act together so travelers can make educated decisions about their cruises.