Local Water Treatment

1. Use copper containers or copper pieces placed in containers for initial treatment to kill microbes. 

2. Follow up with adding peroxide to the water.

3. Run through a commercially available filter system.

There are a lot of details to work out. You can search the internet and see if there's more detailed instructions somewhere other than my messy brain dump on reddit.

You should test the water to see if the system works. (Even if you find detailed instructions from someone else whose system works, your water needs to still be tested initially and periodically.)

Please note: You should kill germs FIRST and filter it second. Do NOT do it in the other direction because filtering germy water will create permanently contaminated filters and filtration system. 

Use of copper to kill germs in water you consume daily MAY give you excess copper in your system. This is not a big concern because copper is a food safe material and essential nutrient.

Adequate salt, the right fats (like coconut oil) and consuming metal mobilizers (like cilantro, coriander) as part of your diet should be adequate to address this in most people.

Footnote 

Unless you are using reverse osmosis, filtration does not remove microbes. Anyone claiming their filtration system removes germs is lying to you and probably cannot back that up with testing. 

This is pretty much guaranteed to make people sick who will get steadily sicker with mystery ailments the longer they use a method that doesn't actually work. 

Reverse osmosis is technically difficult and not cheap. The above solution should be technically approachable and affordable.