Now that the weather is warmer I’ve brought back out one of my favorite pieces of field kit that I completely forgot about! I remember when the only options for potable water in the field were boiling, iodine, or expensive pumps, so this has been a total game-changer for staying hydrated while only having to carry one bottle (at least since there are water sources everywhere in my area):
I’ve found they’re cheaper at physical stores like walmart. There are similar products now from Lifestraw as well. This one screws on to your standard soda bottle (in addition to the squeeze bottle it comes with). Really versatile, dead simple, takes a load off. And when I let one freeze in my car (apparently a no-no), it was cheap enough to replace painlessly.