We have just returned from a gruelling 10 day unsupported trek from the West to the East Coast of Costa Rica. We were using Water-to-Go bottles and thought they were brilliant. It was great being able to pull water from a stream and drink it straight away rather than have to wait 1/2 an hour for a purification tablet to take effect. The water also tasted like it should and didn’t have the chlorinated taste that often comes with purification tablets. I would highly recommend the Water-to-Go bottles to anyone going on expedition, or even travelling, in areas where the drinking water might cause illness, the bottles are a great easy to use solution that really work.