Lightweight modular water purification system with reconfigurable pump power options

A water purification system, comprising:

• a plurality of modules connectable by water flow conduits, the modules carrying at least one water filtration element, and at least one water pump coupled by the conduits to the water filtration element;
• an electric motor and an internal combustion engine;
• wherein the modules include a filtration module and at least two pump drive modules, wherein the at least two pump drive modules includes one module carrying the electric motor and another module carrying the internal combustion engine;
• wherein the water pump is configured for selective coupling to one of the electric motor and the internal combustion engine by engaging the water pump with one of the pump drive module carrying the electric motor and the pump drive module carrying the internal combustion engine, whereby said motor and said engine are structured to alternatively couple with and power the pump.