Only in good conditions.
It doesn't cover virus removal at all and in potential survival in war conditions or even just evacuation centers etc, you'll need to cover viruses in water as well, not just bacteria.
It was something we also had to look into very carefully and we ended up with 2 systems. A Katadyn (? spelling) water pump filter system and a solar rechargeable UV pen (to deal with viruses). But you can deal with viruses by leaving water in a clear plastic container out in the sunshine for a period of time. How long depends entirely on the UV index. In Europe, you're looking at an all day scenario rather than a couple of hours that is all that's needed in Australia (because of the hole in the ozone layer) , hence why we purchased the solar rechargeable UV pen to treat water with. Never got ill so I guess it worked.