so i was just looking on youtube and came across this guy (viperkeeper) hand-watering his snake...he has a whole collection of venomous snakes, and he mentioned in his video that he preffers to hand-water them to ensure they all get hydrated properly...is this normal? should i be doing this too? if so, how often? here's a link to the video...i'm not sure if anyone's seen it before...it's a Gravid Wagler's Pit Viper...a real looker

http://www.youtube.com/watch?v=y9LhUfoBqqk