Do anorexics drink anything

More likely than not, yes. Your body needs water far more than it needs food, though it still needs both to survive and be healthy. Drinking in the sense of alcohol - probably not because most forms of alcohol are high in calories. Most anorexics will stick with water. Some might have diet sodas and such, others might have a flavored or carbonated water. Almost all will drink something that is low-cal with little to no sugars in it, though.