Where is the drain hose for the ac mine must be clogged water is draining into the passengers floor?

is it just water- which would be condensation from the condenser core- or is it antifreeze, which would mean a bad heater core? soak some of it up with a white paper towel- if it's green (regular old stuff)or reddish orange (Dexcool), it's antifreeze and you get to put a heater core in it.
as for where the drain is, it should be on the engine side of the firewall, somewhere along the bottom of the heater area.

It is only water I had my ac on for about 2 hours and there was a huge puddle of water.I have looked everywhere I can't find it?