This thesis represents a first feasibility study to adapt a Hall effect thruster (HET) currently available in the Sitael lineup to allow it to use water like propellant. Electrolysis process splits H2O in H2 and O2, then the generated gases are respectively employed to feed the cathode and anode. This concept could be revolutionary as it allows to significantly decrease the costs of the propellant and reduces safety risks for propellant's handling on the ground. An overview of the water thruster state of art is given. Then a potential propulsion system architecture to support operation of a HET with water is proposed; it follows a discussion on the possible ways to guarantee a correct mass flow rate at the right pressure for both oxygen at the anode side and hydrogen at the cathode side.