Water is a must while hiking and when you can't carry enough for your trip, you clean it in the backcountry. Mountain streams might be tempting, but even if it's crystal clear, it's definitely dirtier than it looks. It'd be a serious bummer to get giardia halfway through your hike. We've compiled a list of 10 water treatment brands and we want to know your favorite. Plus, tell us in the comments whether you prefer filters or tablets.