I attended a workshop on CP's at the Ohio State University and was instructed
to add H2O to all the pictures; and, make sure H2O remained in the pictures.
The traps do seem to be designed to catch H2O. My understanding is the
enzymes the plant use to digest prey is secreted into the H2O. The prey
does eventually drown; but, the enzymes begin to work on contact. Without
H2O, or at least an extremely moist environment, the plant has a difficult
time digesting prey.
Tony M.