What we store and how long we need to store it are critical. Some supplies will come naturally in certain regions, and we can depend on them -- like rain and snow supplying water. We need foods that wonÃ¢â‚¬â„¢t spoil in storage. Short-term supplies are not a problem, but long term we will need other solutions. Our systems must be designed to operate in many modes, including multi-fuel engines, wide-range, efficient and flexible power regulators, protection circuitry, redundancy and fault tolerance.