The condensate water is laden with bacteria, mold spores, and pollution concentrated from the air. It can definitely be filtered and sterilized, but in water scarce environments you usually can't pull enough water from the air to be worth it.

Condensate is not suitable for drinking and 99.9% of homes don’t have a separate gray water plumbing system or storage tank. Even the evaporator coil in the furnace/fan coil unit is going to be dirty, and the condenser coil outside is definitely filthy.