Water damaged iPhone XS won't start

Last night my phone fell in the water. And i thought it would be fine, because my iphone can get in the water for half a hour. But this morning my phone went dead and when i tried to dock it, but it didn't work. I get an apple logo on my screen, but then the screen goes black again. So it won't start up anymore. Even when I try to charge my phone. Can someone help me? I don’t have a lot of money, so idk what to do…

[Re-Titled by Moderator]