It's likely been asked before. Is there any reason, Exos; like Cayde-6, make breathing, sighing, or cough noises? Also, in the one Cayde trailer, he's drinking at a destroyed bar. So, wouldn't Cayde require a stomach and lungs? If so, then Exos are cybernetic/androids and not just robots.
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There is absolutely nothing organic about an exo. They are transplanted human minds and will naturally attempt to exhibit human behaviors. The drink could be a type of coolant or lubricant. The "breathing" could be a simulated function with the purpose of removing heat. A Golden Age cpu fan if you will.