I know of one airline that has issued all their pilots with their own individual cups with sealable lids to prevent spills causing damage to avionics which had been costing them a lot of money. One individual dropped a full cup of Coffee between his seat and control column. The only thing damaged was his pride as he had to get down on his hand and needs and use a lot of paper towels to dry the floor.��
It's amazing what trouble liquids can cause on an aircraft. DHL disconnected the foot heaters on their B757's some years ago after snow melting off a pilots shoes caused a short circuit and associated smoke.