Around 10 years ago we were fortunate enough to purchase a house which is on around 5 acres of land and has two streams running through it. I don't know how, but for all that time it never occurred to me that it might be wise to have a reliable way to render that water safe to drink in the event that we have a prolonged power outage. A solar system and home battery are on the long-term horizon, but that's not going to be for years, and there is a good chance my wife's sister (who is in fragile health) will be with us for the foreseeable future.
The streams from which I intend to draw water host a thriving and healthy ecosystem of plants and animals, so I am confident the water itself is relatively unpolluted, but there are cattle and other livestock on adjacent land upstream and we must have a filter+UV apparatus on our well system.
I am interested in hearing your thoughts on systems or products which will be appropriate for producing clean water to support 1 man and two women for at least a month. Bonus points for longer endurance, an indefinite supply would take a load off of my shoulders. There are so many options and they have changed so much since my time in the Boy Scouts that I don't know where to begin.