Can I just empty water tanks instead of winterizing?

juggledog wrote:
I live in Portland, where the average lows don't usually go below freezing, but you never know.

In regards to winterizing, can't I just empty the water heater tank and fresh water tanks and leave it at that? Why do I need to put antifreeze in it? Since it doesn't get too cold where I live, can I get away with doing this?

I've never winterized before, and I'd like to avoid doing it if possible.