Towing service has filled water into the tank

Moin, after last Saturday (in my opinion; my petrol display is broken) I stayed there due to lack of fuel, I call when I stayed on the road, most pleased the breakdown emergency service. He came, filled me (conspicuously) gasoline in the tank. Unfortunately, the motorcycle still did not jump on. The towman wanted to leave as fast as possible and then left there. Yesterday then I broke up the whole motorcycle again in peace of mind, Spark plugs removed, everything checked. Couldn’t find the error and wanted to go to the workshop today. Just then the head of the towing service called me: The colleague filled me with water in the tank… Now my question: What damage could have occurred to this thing, which work is necessary by a workshop? e.g. something like: rust in the tank, fuel filter ruined, other filters, injection valve, gasoline pump…? Oh yes, is an injection engine F650GS. Still horrified greetings ~zula