irst remove the battery
and let it dry (if you can find silica gel beads put a bag of them with the phone in a close plastic bag.
and wait about 48-72 hours ) it should dry the water.
does the soda contain sugar ?
if yes you will need to get it to service asap before crystallization will accrue .
in any case do not turn it on or try to use it when it is wet you can cause big damage .