best thing you can do is get someone inside the car with ur back seats down and you outside it hosing it down
aim it straight down the trunk area to see if your rubber is leaking first
if no drips then try at the bottom of the rear windscreen and rear wiper and see if that leaks
if still no drips then try aiming it straight at your tail lights
if it leaks when aimed at your taillights then the red lense is parting away from the black frame... silicon can seal up that gap and hopefully no more water
it could be that your taillight gaskets are old and corroded so you may need some new ones of those
tomorrow if i get time i will take pics on how i fixed our taillight leak
