Part of dealing with tilt comes with experience. Part of it depends on mindset. The first step is recognizing that you are tilting, and adjusting accordingly.
Tilting doesn't mean you necessarily go on a spewing spree. Tilt is when your emotions go overboard and it affects how you play. You just have to come to a point where you know suckouts will happen (it's part of the game), and eventually, in time it will get easier to deal with.
We have a great article on dealing with tilt here
, and Storm Raven made a really nice (and long! ) post about it here