I have in the past utilized a "filter/funnel" assembly commonly known (then) as a BAJA FLTER. It cosited of a funnel with a stack of ( I think) 4 or 5 different fine mesh filter screens that would remove almost all contaminents, including water, from fuel being pumped into the vessels fuel tank. I remember it being a slow process, being as that it was not being forced through the screens under pressure, but relied on gravity.
I would like to find one of these filters, or it's newer replacements in order to protect myself from contaminated, "third world' fuel supplies. If anyonne knows wher I may obtain one, I would be most appreciative.