To help you choose, I tested the best water purification tablets and assessed them on a number of key metrics. How I Tested the Best Water Purification TabletsWhile I typically use one of the best backpacking water filters when out in the backcountry, I’ve also turned to water purification tablets for their convenience and small packed size. How to Choose the Best Water Purification TabletsShelf Life of the Best Water Purification TabletsIf you’re purchasing water purification tablets for a home emergency kit, keep a sharp eye on the shelf life. Cost of the Best Water Purification TabletsIf you’re purchasing water purification tablets for an overnight backpacking trip, then the cost per unit is typically insignificant against your other costs. Final Thoughts on the Best Water Purification TabletsWhether you are looking for an alternative to the best backpacking water filter or planning your home emergency kit, there are a variety of water purification tablets available.