OMG. OMG. Just been to the Himalayas and OK the walking was good, but the real news is the water filter. We were in the back of beyond with buffalo, sheep and my mate all using the water courses as waste disposal, and we got NO illnesses. It’s a bit fiddly but has 3 filters and will get rid of anything down to and including bacteria size. Only viruses get through. Buy it: Katadyn Microfilter. Compralo
My Epic Journey 