There's a legendary Russian recipe for drinking brake fluid. I've seen claims that this goes as far back as WW2, with Soviet soldiers using their Mosin rifles to treat German brake fluid in this manner.
1. Be someplace very cold.
2. Find a steel crowbar or something similar (metal and long).
3. Stick it in a bucket.
4. Drip brake fluid onto the exposed end such that the liquid flows slowly along the surface into the bucket.
This supposedly filters out most of the chemicals as they freeze onto the cold metal surface, leaving the liquid in the bucket drinkable.
I would strongly advise against actually trying this for real, though.
1. Be someplace very cold.
2. Find a steel crowbar or something similar (metal and long).
3. Stick it in a bucket.
4. Drip brake fluid onto the exposed end such that the liquid flows slowly along the surface into the bucket.
This supposedly filters out most of the chemicals as they freeze onto the cold metal surface, leaving the liquid in the bucket drinkable.
I would strongly advise against actually trying this for real, though.