Hi, How would i go about detecting water with a PIC?

I remember as a kid i made a little water sensor that turned an LED on. I think it used 2 transistors as a darlington pair but i cant find the book i got the circuit from. What about having pulldown resistors to make sure the PIC wont get a signal when there is no water.

Am i overcomplicating things again? It would be nice if i could have a high value pulldown resistor and just put the wires straight in the water but i would need a higher value resistor than the water and im not sure if that would be enough for a reliable pulldown