Hi Paul810, Yes, the whole water filter craze is very confusing. I know there have been some posts around here about that.
A milbank bag can be used to filter out larger particles from water. As for the tiny little bad creatures that may be living in the water, there are so many filters out there that do, or say they do, remove different things it kinda scares me to even use them. Do water filters work?
Also you could always just boil the water since you will already have a way to do that. Boiling might always work but the filters may not.