Ever since the 'Longbow' scenario from days of old, I've always had an empty gatoraid bottle or something with a large neck near the computer for events.
I've never used it (but still had a bottle ready) until this month during the 2nd frame of the Normandy FSO. Let me just say it came in real handy.
(thankfully, the computer is on a different floor than the wife and daughter and they were also fast asleep)