SawyerProducts SP140 Personal Water Bottle Filter, 34-Ounce,Blue

I like its design, just fill up the 1 litre sawyer bottle with water and as you drink from it it is being filtered.Very happy with my two purchases.

I spent a week in India on a business trip. First time in India. I filled this bottle from bottled water (taking no chances) and only ever drank from this filter bottle (or bottled beer in the evenings). When I cleaned my teeth in the hotel, I squirted water from the filter bottle into a dry cup and used that to rinse my brush etc. All in all, after a week in New Delhi, I returned home in good health WITHOUT Delhi-belly!It may seem quite expensive but I persuaded my employer that it was a small price to pay for my well-being and far more cost effective for them to pay the £51 for one of these than for me to be ill while away and not achieve the objectives of the trip, and/or be ill on my return and be off work for a few several days. My employer had no objections.While I am glad I took this filter bottle to India, unfortunately it didn't help much with the 47 degree heat and the inherent risk of every car journey from the crazy free-for-all approach to road user etiquette.