The main purpose of this work is to develop the first version of an automated tool, that is capable of defining the functional architecture and sizing a water recovery and production system based on a user input set. The work was carried on in collaboration with Thales Alenia Space in Italy at the Turin company site, which is strongly involved in space exploration related technological developments. The software is intended to help the user to estimate resources needed to support a small crew to live in a harsh environment. Starting from Thales Alenia Space know-how in the life support system for astronauts on ISS, the focus is concentrated on exploration scenario for the Oil&Gas industry.