The MSR Trailshot Water Filter is a small survival tool that will make your adventures that much easier. It’s a piece of gear that can easily fit in your pocket or pack. When you need to drink some water or fill your bottle, pull it out and put the straw end directly in the stream where it instantly removes bacteria, protozoa and particulates up to EPA standards. It’s very easy to use and can filter one liter in 60 seconds. Get one on Amazon for $50.