If it's pop and there are free refills, I will be having several. That being said, if it is not a fast food place where a drink is included in some kind of "value meal", I will have water because I feel that the prices for pop in the more "sit down" places is robbery.
As far as "drinks" I almost never order a drink at a restaurant. Sometimes on vacation my DH will insist I order one. So on that ever so rare occasion, I will order a glass of wine. It just bothers me that a glass of wine in a restaurant costs as much (or more) than the bottle off the shelf at the store. At a winery it is different, you are going there for their wine specifically and it is part of the experience. However restaurant/bar wine, they can keep it.