No, I don’t believe so. Exos weren’t designed to eat and drink and their minds were tampered with to remove the sensations and urges. But the latter was a major problem. The absence of these sensations/cravings makes a mind reject the body, causes them to die because they feel they are dead. So since an Exo doesn’t have a heart to beat or lungs to breath, it’s a programmed sensation. So too then would hunger and thirst. Otherwise the entire torso would have to be redesigned to contain and expel the stuff and that’s just disgusting. And costly, redesigning what was already an otherwise perfected Exo frame. When mental tampering is soooo much easier and established as a solution. So in your scenario, I would write it up like that when they Act like they eating or drinking, they feel like they really are. Because Exos only truly work because they are being fooled into accepting their bodies. So everything has to be designed to enable that self-deception.