Try @rd2rk's suggestion here
48v into send/return by mistake. Will it damage? - Helix - Line 6 Community
This was for a Helix with a screen problem so worth a try, it solved the screen issue in this thread
"If the screen is still black after a couple of reboots, use HX Edit to do a backup, then do a Factory Reset by booting while holding FS 9+10."
You still haven't mentioned what the drink was and if the inside has been checked now, soft drinks, beer, etc will dry and leave deposits on electrics that can cause issues and really need to be cleaned off, I'd suggest that the advice above is only carried out when you're happy that the inside is free of any liquid deposits/residue