Is it okay to just wash my face with water for the morning cleansing?

I've noticed that some people just wash their face with water in the morning. I've also seen actresses on TV doing the same, and since it seems simple, I sometimes follow suit and just wash with water. However, when I'm feeling a bit self-conscious, I use a foam cleanser. I have dry skin, but I do have some sebum on my nose, the sides of my nose, and my chin. In the summer, I'm naturally more concerned about it, so I tend to use a foam cleanser, but when I'm feeling lazy, I occasionally just wash with water. I've been wondering which method works best for me.