My wife and I have a small disagreement over this. When you go to a fast food place and you have to fill your own drinks, does this imply free refills? Some places remove the ambiguity by placing signs either allowing or forbidding free refills, but I'm talking about places without signs. My opinion is that if you own/manage one of these places and decide to install self service fountains, you've probably decided it's not worth the hassle to police it so you just give them away as a goodwill measure. What do you think?