They usually have ice machines ... they aren't very clean I must tell you ... they're rusty, leaky, moldy pieces of shit. And they break all the time. Yeah they use tap water to make it, but while tap-water is non-contaminated, ice cubes are stored in a dirty, leaky container waiting to be frozen and shot out, then scooped out with a dirty scoop or hands. Tap water has enough chlorine to kill most things, unless it's filtered and frozen by an ice machine, then handled un-sanitarily. (assuming there's a filter on it)