My sickness could have been ANYthing. I also had a tuna salad bagel at the Radisson in PPT during our day-room stay, and that could have been the problem too.
We've had brown water on one of our SS cruises - not through the sink, but in our suite's jacuzzi. I did freak out a bit about that. I mentioned this to the guest relations manager aboard the PG, and he said it's not uncommon at all among cruise lines. I can't remember the explanation behind it, but it sounded satisfactory at the time! :) No worries, it is safe to drink.
That said, I am like Kathy, I would prefer to use bottled water in the bathroom sink :) , and I have gotten so spoiled that I don't even drink the tap water in our city, which has won worldwide awards for its pure and best-tasting tap water. I know for sure that it smells much better than all the other cities we've lived in across this country (too many to mention)! :)