Liquid fuel supply system (12) for a combustion system (14), in particular a gas turbine, including at least one storage tank (16) for liquid fuel supplying at least one injector (34) connected to a combustion chamber (32) of the combustion system (14), said liquid fuel supply system (12) including a first piping section (18) disposed downstream of the tank (16) and a second piping section (20) disposed downstream of the first piping section (18) and upstream of fuel nozzle (34) in each combustion chamber (32), said first piping section (18) including at least one pressurizing means (22), and at least one injecting point or entering (24) for a water-soluble product, and the second piping section (20) including a mixing and distribution flow device (26) configured to create an emulsion and distributing the emulsion flow rate to at least one piping (28) connected to said nozzle (34).