Do you drink your airlock?

[homebrewer_99]

No...I find it akin to scraping ice off the inside of you freezer to keep a drink cool versus a real ice cube.

There's got to be a whole bunch of impurities in there.

 

[DeathBrewer]

Actually, condensation is distilled water, if you can find away to keep it clean long enough to collect a l lot of it, it wouild be good stuff, for certain application.

Dehumidifier water, anyone?

If you could have it drip down into a bucket, or collect it regularly, then all you need is potassium metabisulfite.