The list author says: "The Rule of 3: 3 Minutes Without AIR 3 Days Without WATER 3 Weeks Without FOOD Water is one of the biggest topics in Survival Forums. I do not use chemicals to treat my water, so I use premium filters and if there's ever a question about the cleanliness of water, I boil for approximately (3) minutes. Since water is so important, I carry a back up filter when I'm on the trail. Some of the items below are what I carry every day in my EDC Bag. I still use the Boy Scout motto "BE PREPARED""
"This is in my Every Day Carry bag. Generally I use a cotton rag or T-Shirt to pre-filter / strain water prior to filling this container. I keep a Zip Lock bag inside the empty bottle so I can carry additional water."