Ludisia Discolor shoot fell off

[rachel.gazelles]

So I have cut off the end, and found this water bottle that holds the shoot in it pretty well. The water is up to the top, do I have enough of the shoot in the water? Or is this about the right length? There are 2 nodes? under water. I'm not sure if nodes is the right word for them..
Either way, the water here is very hard and I used just regular tap water without fertilizer or rooting hormone. Hopefully it will sprout roots!