We have recommended steri-pen style purifiers before, but have to confess this bottle goes one better&mdashnot only does it let you drink any water short of Chernobyl, it lets you carry it away to dry desert territories. For 1,000l worth of water per hollow-fibre, chlorine- and iodine-free straw, not a bad investment. Rs 1,790, www.ascreations.in
