I keep one in my camel back with a compass, lighters, and a letherman.
Sure, that’ll supply enough water for 3 or 4 gerbils. Just kidding, I keep one on my motorcycle to use streamside. But you need to be able to disinfect also.
You can buy an excellent water filter called Berkey. I bought mine from Lehman.com- the specialize in non-electric home goods. Having lived for two years here in the Litlle f’n House on the f’n Prairie with no utilities, it’s safe to say that general store has seen a lot of my money!
I have the Big Berkey. It will filter about 2 gallons probably twice a day. There are two different types of filters, I only use one. I did not buy the one that maybe might filter out radiation. A lot of NGOs use these filters in 3rd world countries. I would haul water from my son’s house and never got the dysentery (as my mother said I would!).
I was thinking of selling the Berkey (I’m up out of third-world living now, even have a microwave) but I think I’ll just find a place to store it. It would be stupid to get rid of it.