I know I wouldn't dare do it. Smell the water. It smells like metal from the coils. Not to mention you would think it would be clean since it was pulled out from the moisture in the air, but guess again. How clean are your coils and your bucket (or whatever you catch it in). I would stick to conditioned tap water before I would do that. Of course I don't have a RO/DI system so I won't even dare recommend something obviously better than I do.