If you dropped the entirety of the Ice moon of Europa on Earth, a moon entirely composed of ice as far as we know, still wouldn't contain enough water to cover the entire Earth, not even close.

Also if you did somehow come up with all of the water, and somehow also it went away later, all the sea creatures which presumably Noah didn't bother with, because they never mentioned in the Bible, would die due to the unimaginable increase in pressure that would result from all that water being dropped on Earth.