True. There are those purpose-built atmospheric drinking water condensers that can be purchased with a small solar array, making for a self-contained water generation system (YMMV of course, depending on how much sun and humidity is typical in your area). I've pondered one of those units myself, less for emergency purposes and more for generating everyday generation of purer drinking water that doesn't have chloramines and their byproducts, flouride, and other contaminants that municipal water contain.

I would certainly purify any condensate from my A/C before drinking. No telling what kind of slime or mold is festering in the system. However, if your A/C can make enough water to make a practical dent in your garden's daily water consumption, seems like a win-win.

We've had an unusually cool summer here in Southern Cal. With the number of times I've run the A/C this summer, I think I've made enough condensate to keep a small shrub alive. Think Kevin Costner in Waterworld and his tiny citrus tree.