Face ID

If the phone fell in water, there is probably more damage that you will experience later. Electronics and water do not mix well. I suggest that you make an appointment at the nearest Apple Store for an evaluation and explanation of your options. Check this link...

Apple Store - Find a Store - Apple

kathy frompearl river Said:

"Face ID: My iphone 11 fell in water and now my face ID won't work . What can I do?"

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Extracting the Water...

Take it to a Retailer:

The only inexpensive way I can think of(an it will cost money) is to take it to a retailer, seeing if they have a device that gets the water out of a phone. Retailers have these.

You are welcome.