Proozy offers the LifeStraw Personal Water Filter for $19.99. Coupon code "DN14" cuts it to $14. With free shipping, that's the lowest price we could find by $5, although we saw it for a buck less in June. (For further comparison, we saw a 3-pack for $30 in July.) This award-winning, BPA-free device enables you to safely drink contaminated water. It removes almost 100% of waterborne bacteria and protozoan parasites and will filter up to 1,000 liters of water. Deal ends September 18.