but you could try to let the light rest a few days/night in rice (something what I probably should've done with my first TK75 at first)
Don't do this. Rice does not draw moisture out of the air. It only draws moisture from a surface it is in direct contact with. The only thing rice can possibly dry out is the outside of your flashlight. And you risk chaff getting in the threads or other surfaces of your light, and possibly damaging it.
Putting any electronics in rice is almost always a BAD idea. It is a myth that keeps getting spread around.
If you get your electronics wet, dry the surface off with a towel then open it up to let it air-dry for a few days. Adding rice will not help, and could actually make things worse.