Could you fill the tanks with a garden hose at the farmhouse?
The old farmhouse collapsed before we even bought the place. We don't have any electricity service out there right now.
However, I agree that modern AC electricity is a miracle cure for most problems like this. I did test the old well by the house a few years ago. The static water level is just above the bottom of the shallow well. The water I test pumped was very dirty. In hindsight, I now think that just might have been topsoil that worked into the well through some holes in the casing. It might be capable of producing clean water if I ran the pump for an extended period.
I may have to explore your idea sometime in the future.
