why air conditioner water inside the truck?
Air Conditioner water? Do you mean windshield washer fluid? There is a nozzle that sprays on the back window for the wiper. It is in the roof, maybe the hose detached or is split allowing the fluid to seep into the interior trunk area. You will need to remove the headliner to find the leak. It might also be a bad back hatch window gasket seal, and just plain ol rain water is getting in. The AC condensate will not travel back that far in the vehicle.
If you have a sun/moonroof, it could also be that the rear drains are clogged.
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