I have read that once some prey is caught that the movement causes digestive juices to be produced. I will typically just add some distilled water in the pitchers to get things started.... it at least gives the prey something to drown in to get the bacterial rot to start.

Hi guys

The liquids that are in the pitchers are formed while the pitcher develops.
You will see as a new pitcher forms on the plant that it is sealed and empty, as time goes on and the plant groes the pitcher you will see the liquid form inside until it finally opens.

I have read that when prey moves and struggles in the pitcher, the plant can sense it from the moving liquid (from the ripples and moving liquid), the plant then produces enzymes which turn the liquid very acidic.
I think the plant should continue to produce more liquid over time as this would slowly evaporate.
When I have seen an empty pitcher on a plant its not long before the plant shuts its lid tightly in the same manner that it was while developing, I dont know for sure but would imagine the plant would then try and fill the pitcher back up.
Distilled water should not be needed unless the pitchers are empty from postage, if you do this, fill them 1/3rd full.
I have read (but cannot be sure of this) that one guy found was told if he fills the pitchers to give it a gentle shake from side to side as this would cause the plant to make the liquid acidic.

Cheers

sheldon