>>/811340/
Dirty. Gritty from charcoal.
I didn't work my clay properly so the charcoal got dirt in it. My sock didn't make a good filter because it had elastic, I would have been better folding a tshirt because it was only dirt after all.
I didn't grind the charcoal very well, nor was the sand clean.
Hard to say if the cumulative effects were sufficient, or if I could have just drank the water as it was and been fine. Nothing in my survival kit was even remotely useful.