how do i get my true depth camera to work again after dropping it in water

After dropping your iPhone in water, it is very likely catastrophically damaged.

Start here.

iPhone Repair - Official Apple Support

ashtonchapman Said:

"how do i get my true depth camera to work again after dropping it in water: how do i get my face id to work again"

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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.

Face ID has been disibled