How do commercial airline pilots "evacuate"

How do commercial airline pilots "evacuate"?
On a recent trip from Cleveland to Phoenix, I noticed that while I got up to relieve myself twice during the flight, I never saw the pilots leave the cabin. (I was in first class so I'm sure I would've noticed.) Now I'm thinking these guys drink coffee, water and soda just like the rest of us, so how do they hold it for a 3 hour and 45 minute flight? Ouch!
Air Travel - 2 Answers
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1 :
they do.... sometimes f/a puts a cart sideways in front of cockpit door, sometimes f/a and captain or fo switch places for duration of the crew member's "relief". No, they don't have an old milk bottle in the cockpit!
2 :
Cockpit crew can leave to use the lav in First class when needed. There are procedures in place for that.