You can clear a refrigerator drain hole by inserting a screwdriver or a small length of ¼-inch flexible tubing into the drain tube to clear out any remaining obstructions and/or to push the clog into the drip pan.
All fridges have a drain hole and defrost drain tubes except for certain older manual defrost models.
The drain tube will go to a drip pan that is underneath the refrigerator.
Only fridges that have a defrost feature typically have the drain pan and drain hole.
Most refrigerator models have the defrost drain on the inside back of your freezer, so finding the drain hole on your fridge shouldn't be too difficult.
After you find the drain, look and see if there is anything that could be blocking the drain, such as frozen meals, ice build-up, etc., and if there is, simply move them out of the way to allow proper airflow.
If you have liquid water on the floor of your fridge, check that the little hole isn't blocked with gunge.
If it is, poke something down it and you'll be fine.
Other than that there shouldn't be any need to drain water from a refrigerator unless you are defrosting it.
The drain tube goes to a drip pan underneath the refrigerator. Water created by the self-defrost cycle goes into the drip pan where it is evaporated.
Compact/Under-Counter Models: These models do not have defrost drain tubes or a drip pan underneath the fridge.
To clear your fridges defrost drain you can insert a screwdriver or a small length of ¼-inch flexible tubing into the drain tube to clear out any remaining obstructions and/or to push the clog into the drip pan.