DIY Pump Plumbing Kit : overlanding

I am looking to build a system that lets me pump water out of a bucket, pond, river, etc. Ideally something very similar to the Joolca Off Grid Plumbing Kit. The Joolca will not work for me as I need something with with a longer hose and I want to use my own pump. Only part I am not sure exactly what its called or who might sell one is the what Joolca calls the “weighted two-stage water filter”. Appreciate any feedback/suggestions. Essentially the end that would go in the water source.