I was up to room 49 of the CoO, killed one of the knights and had one bottle of fairy tear's left. Now the thing is I thought the fairy tears would revive me to full hearts when I was dead. I fought hard and got killed, not really panicking but I sat there waiting as Link lay on the ground and the game over music and sign came up... and I screamed out "WHAAAAAAAAAAAAAT!"
And so I learnt the hard way.
Woot, just completed the ordeals in about an hour and a half. Didn't have to use my first blue potion till about room 30. Heaps of fun too.