I have spent months looking for reasonable easy way to make potable Water from lakes etc. Just found one. Monolithic dome water filters. Hard to find vendor. Cheaper than dirt has them for 29 plus shipping. You need to get two food grade 5 gallon buckets to build the frame but the rest is included in price. Takes out 99.9 to 100 percent of just about everything.
There is a YouTube video done by a survivalist demonstrating installation.
Ever heard of a “Solar Still?”
All it amounts to is a sheet of Visqueen arched over some damp ground. pretty cheap.
BTW, a plastic soap bucket is as good as a “food grade” bucket, and way cheaper. (free)
Did you get one? Does it come with written directions?
Because a film on the internet won’t do when I forget how to set up the filter if it’s SHTF time.