How was your day?

chapstick/lipbalm, eye drops. got it. does drinking more water/isotonic drinks help ?

Honestly in my opinion it won't make much difference, though people don't get enough water daily anyways, so increase yours for that reason alone, if any. Like Alley said, lotion in general will help if other areas of your body begin to dry out dramatically (Aquaphor also makes a general body lotion).

I'm probably not the best for anecdotal advice because I was only on Accutane for 4 months, from May through September, and so the summer weather really helped keep my skin from getting ridiculous, as I'd imagine it would for some in dry, cold weather. Just be conscientious about how your body reacts in whatever climate you're in and respond accordingly.