Hi Sadie,
Do not try to turn your phone on/press buttons! This sends electricity through the wet circuit boards, which can cause more damage and corrosion. Additionally, using the rice method for fixing water damage is not very effective. Rice doesn't do much of anything to dry out your phone, and it wastes valuable time!
Take a look at this guide for suggestions on how to more effectively fix your phone: [[Electronics Water Damage]]
This guide may help you get started on taking your phone apart, if you choose to do so.
[guide|64327]
Good luck!