When out hiking I drink about 2 litres of water a day and require more for washing and cooking but since water is heavy I seem to never have enough with me. Currently I am looking for a water filter that is light and will allow me to use water from streams and where every I find it but also be able to filter out bacteria and all the nasty stuff. I want it to be able to fit a bottle so I can refill when necessary. I have a nice ponc stainless steel bottle with a 50mm opening so want something to fit it.

Any suggestions welcome