Possibly, but it’s unlikely to be economical. Completely white images after water exposure strongly suggest internal electrical or sensor-related damage. If the battery remained installed while the camera was wet or drying, corrosion/electrolysis may have damaged circuitry, which is difficult to repair.

The only practical way to know is to send it to Canon or a qualified camera service center for evaluation. They can inspect it and quote for repair or part replacement.

That said, on an entry-level body like the Rebel T6/1300D, repair costs are often higher than the camera’s current value, so replacement is commonly the better choice unless the estimate is surprisingly low.