If you ever find yourself in a scenario where clean water isn’t available. Beer might be one of the few things you can drink that won’t kill you.
... Because the process of making beer consists of boiling the wort!
But if you can boil water to make beer, you can just, well, boil water to drink.
People have known since antiquity how to make water potable.
Also, putting sterilized water into airtight sterilized containers, as normally done with beer, works well. Carry a can of Liquid Death with you instead of a can of Bud, the weight is the same.