They love water and IMO you should provide at all times a water bowl big enough they can soak their whole body inside this will also ensure you get good humidity and aid sheds as well. A hide either end of their enclosure especially as hatchling's and don't drown them in too much space to begin with as it can stress them out, in general the bigger they grow the more confident they become same for every animal on the planet and snakes are no different. An example of water bowl I use for my bloods.
snakey
Quick question, do you have a problem with them tipping that kind of container too much? I've been trying to find something better and less easily tipped.