mine sometimes drink after eating or when i freshen up the water, but consider that they come from Africa where it is often dry! they don't usually have such immediate access to water and as such, don't always need it. I recently read that they can retain their urine to absorb all the water from it if they are lacking water, which is why sometimes their poop has white chalky stuff in it, that is the urates without way less water in it. I am geeking out to how cool that is. i wish i could do some of the stuff my snakes do! XD

oh and just because they can go without water doesn't mean it's ok to let them go without fresh drinking water! Just in case anyone thinks that's a good idea-it isn't!