My very first Caffenol processing experience came out just ok, but considering I was using a Olympus Trip camera indoors with no flash I guess I was lucky to get something to post.
The film is Kodak B&W 400 C41 processing.
My recipe for 350ml of water was:
15g - Instant Coffee (Walmart own brand)
08g - Washing Soda
08g - Vitamin C
I then let it fix overnight using a solution of 52.5g of Sodium Thiosulfate (15g per 100ml of water)