I've researched the water prison jutsu, and getting caught in it is almost an instant KO for every OC we have. The water is specifically stated to be particularly heavy and is excellent at restricting movements. I assume that is why everytime someone gets caught in a water prison they don't try to jutsu their way out, because they can't. There are only two types of people who can escape the Water Prison jutsu(through relatively normal means; no teleport, Susanō etc.), those who's name ends in Hyūga, and Water style users. Water style users can use a jutsu to increase the volume of water in the prison and cause it to collapse, it should be noted that the particular jutsu used for the only time in the series a water user escaped the water prison was performed with only 1 hand seal, and it was done by Kisame and it wasn't even in the anime it was in a Hiden book.