Try a relative low volume inexpensive submersable sump pump with a hose fitting. Its the kind that's open in the bottom and can draw water down to 1/4" depth. It costs about $40-$60.
I use one to draw water from a stream for irrigation. I placed it in a milk crate about 1/4 filled with small stones, and stones surrounding it to filter out any sediment. I carefully dropped whole thing in the stream and plug it in to use it.
Thinking back, a bucket drilled with holes and partialy filled with stones would work better- and be easier to drop into the stream. The crate was all I had at the time.....
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