Nothing usually. I'll wait till my stomache starts growling before I decide if I should eat or not, but even then I might not eat if I don't feel like eating. At the least, I may grab a coffee. But too much coffee too often is sickening, so I may just grab a water instead. But of course, tap water sucks big time, I'll grab a bottled water from the machine. If the damn machine runs out of them sprinkly water, I grab the so-called filtered water beside the water fountain. But on some days, I forget my damn water bottle. So um yeah, in that case, I will neither eat or drink.