Just interested example Prusa mk3 multi extruder system.

Just interested example Prusa mk3 multi extruder system. Only one hotend (v6) and two or four bowlen extruders. I just want two extruders one normal material and other support material (water).

Just want to ask here anyone use that kind system and how that work. And can i use marlin or smoothieware firmware to use that two extruder kit.

Here example what i mean: