One of the Ukrainian Mysteries we run into is the appearance of these water trucks around town. They pull up on the sidewalk, people get in line and fill up their huge ten liter water bottles and head out. We don't see any money exchange hands and so we are assuming it's free. But how do people know when they are going to appear? There doesn't seem to be any pattern of time or location and if you happen to see one, grab your bucket and come running.
The reason behind the free water is that Ukraine has some of the worst water in Europe. Boiling the water doesn't help the situation because it's not a bacterial problem. It's a heavy metals problem from pollution from industry and farming. So unless you enjoy mercury, lead, and some chromium it's bottled water for you. I use the water to cook things like pasta...food that we aren't going to drink the water. If you are making soup it's with bottled water. I do use the water to brush my teeth but I make sure to never swallow any of it.