LifeStraw Personal Water Filter, Blue, 1-Pack (Amazon ASIN B006QF3TW4)

Not a giant markdown, but a good excuse to finish the go-bag. The LifeStraw Personal is the simple straw-style filter that hunters, hikers and preppers tuck into packs and gloveboxes. You drink straight from a stream or a jug, with no batteries, pumps or chemicals. Amazon's listing says it removes 99.999999% of bacteria and 99.999% of parasites and is rated for about 1,000 gallons. It's $14.99, down from a $17.95 list price, shipped and sold by Amazon, and it was in stock as of early Sunday morning. Free shipping needs Prime or a $35 order, so it pairs well with other things on your list. Prices move, so confirm it in your cart.