Josh and Stefan came to nice idea of different water upkeep for hauses. I think that to balance gameplay a special building for house Harkonnen could be introduced. This building would contain Freemen devices, present in Frank Herbert`s book, that remove water out of bodies. This way Harkonnen player could sacrifice his infantry unit to gain much more water than he/she spend on training it. From economic point of view this is simply trade: spice + time spend on training of unit, time + resources (spice and energy) spend on building and maintaining the structure for water.This proces should be much more economical alternative for buying water in spaceport. It would also make Harkonnen really evil.