[Steve Carlton]

I'd say it's the same amount.

1 oz ink gets added to 10 oz water, so the water bottle is 10/11ths water. One oz of this is 0.909 water into the ink jar. The water bottle is 1/11 ink, so 10 ounces x 1/11 = 10/11 = 0.909 ink in the water jar.