You will NEED A PREMIUM HIGH PERFORMANCE WATER FILTER to be sure your water is safe to drink. There are many water born diseases and some can make you violently ill and some can kill you.
There are several options available to you, but the cheapest option is to build your own filter system using two plastis pails and a high performance filter that will filter out about everything that can harm you.
Here are some filter options for you to consider:
https://alexapure.com/collections/water-filtration/products/alexapure-pro-certified-replacement-filter
https://www.usaberkeyfilters.com/product-category/berkey-filters/
http://www.aquacera.com/
With this we like and have used the CeraMetix GF filter and we found it a very good option for you.
Here are three good water filters that will filter water from a creek, pond, swimming pool and make it safe to drink.
We like the ceramic filters as you can clean them up with a green Scotch Brite pad when they clog up or slow down and they will filter water like new again.
In our instructions we use the Black Berkey filters, you can use what you like and the filter that will work best for you.