I might be showing my age, but look up some of the stuff that went on in Sarajevo for an idea of what could be required in the medium term.
Round here, and just over the border in Germany, the recommendation is for ten days of self sufficiency at home. After the day when water and electricity had both failed (the digger repairing the water-main had bust the power-cable) yet the gas was still working, one of the neighbour apartment dwellers managed to set a gas heater on fire and get their apartment going - so now I have two large foam fire-extinguishers as well.