Answer to: does not boot after water damageSounds possible for the keyboard replacement, but also look for any corrosion or burns (depending how long it was before it was opened) and use a soft toothbrush with 91% alcohol to clean it off so it doesn't get worse. Just to be on the safe side and also if you're comfortable taking it apart. Good luck.
Answer to: Samsung Gear Live not turning onI agree with L Pfaff, normally I'd use a soft toothbrush with the alcohol to clean the contacts. Of course make the the brush is clean before gently cleaning the contacts for the battery and any other you have access to. Good luck buddy.