Let dry overnight. When plugged in get a screen that says:
DOWNLOADING DO NOT TURN OFF
Can't do any thing else,. It can't be downloading because there is no wifi or internet where the phone is.
Dealing with liquid damage on a phone is never an ideal situation. We're sorry to learn about the Samsung S7 issues. Do you have device protection such as Verizon Protect or Total Mobile Protection? The would allow you to file an insurance claim for a replacement.