My iPhone X isn't a water resistant device

From its spec sheet:

iPhone X is splash, water, and dust resistant and was tested under controlled laboratory conditions with a rating of IP67 under IEC standard 60529. Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear. Do not attempt to charge a wet iPhone; refer to the user guide for cleaning and drying instructions. Liquid damage not covered under warranty.

If your iPod Touch, iPhone, iPad or iWatch is Broken

Apple does not usually fix iDevices except for batteries and screens – iPhone Screen Repair & Replacement - Official Apple Support – and minor work they can do in their shop. Instead, they exchange yours for a refurbished or new replacement depending on the age of your device and refurbished inventories. On rare occasions when there are no longer refurbished units for your older model, they may replace it with the next newer model. You may take your device to an Apple retailer for help or you may call Customer Service and arrange to send your device to Apple: You can make an appointment at the Apple Retail Store - Genius Bar and take it in for service. You can also look for an Apple Store - Find a Store - Apple. You will find respective repair costs from the appropriate link:

• iPod Service Support and Costs.
• iPhone Service Support and Costs.
• iPad Repair - Official Apple Support
• Apple Watch Service Answer Center.