I'd guess a hand pump installation would work for me, the way you describe it. Ideally, I'd like to have a classic model, just for aesthetic reasons; http://www.nira.fi/en/product/157013/1000/nira-1-antique-garden-pump-2-5...

But, yeah, a cheaper solution might be a good option to start with =)

Heck, half a year isolated from the mainstream society - sounds like an adventure =) In Finland I'd guess it is only people living in the archipelago, who might face longer periods of isolation - when the ice is too thin to travel on, and the sea is too rough to go by boat, the islanders have to sustain themselves without any physical contact to others. Especially people living on remote islands are constantly prepared for that kind of conditions.

So, about how big was the local population in your valley - I mean, were you a dozen or a hundred of farmhouses / families isolated in that narrow valley?