Portable water purification systems are used across the globe by all types of people but the industry heavy use comes from hikers, campers, kayakers and adventure seekers. As portable water purification systems go, there are really three types. Water filters #1 option, Water purification tablets #2 option and boiling water #3 option. A quality water filter is the best option because it has a great energy/ fuel/ time to effectiveness ratio. It is much more energy/ fuel / time efficient to filter water then to boil it and it is much safer then water purification tablets. A good water filter is a must for any BOB of SHTF kit. Here are some of the best performing and most cost efficient options.