Suggest Treatment For Dry Skin

Hi, I usually have oily skin but since thursday my face has been dry and tight. I think it is dehydrated. I was just wondering how much this has to do with the products that I was using. Most were oriented for oily skin, and I also used a Murad Acne toner even though I only got the occasional pimple. So at this point I don't know what to do to restore the sebum! I've always consumed tons of water everyday. All I know is that I will be avoiding sulfates and treating my skin like it's combination and not oily. Please help me!