@Inspired_2write I have a filter from the folks that make the LifeStraw. This has a funnel that you pour the raw water in and it filters through, blocking out everything above a 0.1u size. That gets the biologics as well as any solid contaminants. For any potential chemical pollutants, I also have a large supply of activated charcoal. That will remove all organics (chemicals). That should make it safe to drink with no further treatment. It can do about a liter at a time and is good for thousands of uses. After each use, it has the ability to backwash the filter to help keep it clean. Here is a link to the product:
https://www.lifestraw.com/collections/featured/products/emergency-preparedness-bundle-disaster-master
I bought mine by itself and did not get the two smaller straw filters with it.
In a pinch, take a two liter soda bottle. cut the bottom off Flip the bottle upside down with the normal mouth on the bottom. Use a rubber band to attach a coffee filter over the mouth of the bottle (small opening…not the big opening you just made). Put some activated charcoal (you can order some if you don’t have it) in the bottom to a level about ¼ of the way up. Put some pine needles on top of this, some sand on top of this, and some small gravel on top of that. Pour your raw water over the top of the gravel and collect the filtrate that comes out the bottom. This will get most of the contaminants out of most water, but I would suggest using some bleach or boiling the water before drinking it as the filter will not remove all bacteria, viruses, or parasites. They do sell purification tablets that you can get, but honestly, it is cheaper and just as effective to use a little liquid bleach.