If it is truly the drain tube another the best way to test is to turn on the AC. After a few minutes condensation should start dripping out the drain tube. If not then its clogged. You can try to unclog it with a metal hanger or I'd prefer KlimaCleaner type product where the foaming solution helps break down gunk.
Never heard of the KooAid trick LOL.
LOL, not Kool-Aid... Lubegard Kool-It to clean the coils after the clog is removed. This also helps if you have musty mildew smell when you use air conditioner see link...
https://www.amazon.com/dp/ (commissions earned)
I'm almst certain OP's issue is a clogged drain.. tons of info on CX-9 forum...
https://www.mazdas247.com/forum/showthread.php?123813466-CX-9-Clogged-AC-Evaporator-Drain&highlight=unclog
My friend Acura TL has the same issue, his was a huge repair bill though, the drain hose got plugged and the water spilled over the condensate drain pan and the water spilled over the ECU located behind the center console the ECU got fried.
OP should get it fixed asap, not good to have any water trapped in the condenser coil areas, bacteria starts to grow fast. also corrosion starts to set in quick
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