I cant remember the amount of water, but it was something like 10 liter for ever kg. I was working on the bases that water in the wild is generally a rare resource has better use or was to make it portable.
members of the Craft Brewing Association Uk grew the own barley, malted it and brew with it
what make it though is the change of the water and control the roasting, unless you want traditional brown(blown) malt