This seems like a much more reasonable solution than a fountain. People do not interact with it directly so there should be less biological contamination. Further, you can take it with you which means you will get more of it when you need it, thus staying hydrated. Most fountains I have seen are poorly maintained and have growth or corrosion of the faucet. Bundle that in with how awkward it is to use, and how many other strangers are putting their mouth close to it, it really doesn't seem worth it for a mouthful.
+1 for filling stations.