LIFESTRAW :

LIFESTRAW :
  Lifestraw neither has a battery nor is it rechargeabke.Yet,it can be the one thing that can save your life when you run out ,of water in your bottle.

 It is a water Filter,designed to be used by ine person.You can simply put this in your empty wateer bottle and put water into the bottle from any source that might be available,like a stream or a river,or simply drink directly from these sources using the lifestraw.It can purify upto 1,000 litres of water,filtering down to 0.2 microns and removes almost all bacteria and parasites.LifeStraw has a  shelf life  of up to five years ,so it can be stored at room temperature and be reused for your next trip.