Water that has condensed on the fins of the coil (which are constructed either of aluminum or occasionally copper) typically contains numerous trace chemicals and precipitates, and is definitely not potable. In addition, the possibility for biologic growth would indicate against use of any water recovered in this manner. Condensate pans, regardless of the application, develop substantial build-up of fouling and should be cleaned on a regular basis. Several proprietary cleaners are available for this.
In addition, as stated above, the energy required to produce this moisture makes such a system impractical.
In an emergency
distillation might be a more practical approach.