If you carry a jerry or two, your range will be good enough to get fuel in proper fuel stations, I wouldn't bother with additional filtration and water separation. Just wach out where you get your fuel from (and maybe, so once in while, mix one of those fuel system cleaners in a tank).
I never found a drop of water in my fuel filter (the tap of the sedimenter broke, so didn't check that one during about 30.000 African km's)
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