First thing is to remove the battery and leave it off until you have throughly dried out the device.
If the camera fails to come to life...it might be worth using the same method mobile phone repairers use..bathing the logic board in iso alcohol.if this fails to rectify the problem...be aware....
Canon logic boards have two sets of fast blow fuses...which means generally only one will blow.there is information on google as to the location of these mini fuses.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0