The bottom of the drain is quite hard to find under the car, but worth the effort. Use a reasonably stiff insulated wire, like an old light bulb wire, without the copper showing, and shove it up about 6 inches or so. If you get wet, that is good.

Or reach in behind the kick panel and squeeze the plastic drain hose to try to dislodge things.

It might not even be the drain hose... Check the pipe that goes from the evaporator to the compressor. Usually warm, if it gets nice and cold, water will condense on it and drip down to the floor. Same it true of the normally cold pipe from the condenser to the evaporator. Why both of these are not insulated at the factory is beyond my intelligence.
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Keeping it running is better than buying new