My Boscs never drink.....

[varanus_mad]

Lizards are much better at managing water loss than we are, they dont sweat or excrete liquids from a huge surface like we do,

Its perfectly conceivable that provided they keep there core hydration level stable through there environment, they dont actually need to drink, when conditions allow them to avoid doing so, after all its another risk to there survival finding a permanent water source within there home range.