You are not supposed to use "water resistant" phones in the pool. Or the shower. Or the beach. They are just rated to be safe in case you drop them in the water by accident, not on purpose. So if you spill a drink on it, it'll be fine. If you're taking a bath with it or literally using it in the pool, it won't be fine. Your own fault. The manufacturer will not take in charge the device. And don't worry, other manufacturers won't fix their own "water resistant" devices if there's water damage, warranty or not.