There is no doubt in my mind that with the right equipment on the surface of Titan you can refine methane out of the lakes, electrolyze oxygen from the water ic

There is no doubt in my mind that with the right equipment on the surface of Titan you can refine methane out of the lakes, electrolyze oxygen from the water ice of the crust, and fuel a Starship. Can you fit that equipment in a single Starship, by mass and volume? Is that what we're talking about here? No idea.