The problem with talking about 'bottling it' is that it distracts from the actual issues. People talk about intangibles like man management and motivation instead of things that are much easier to control. Pressure will always be there, but you can do things to make the team more resilient and I don't mean mentally.
Looking at the last three games, when the pressure started taking it's toll and our passing and technical ability went wayward and decision making slower, we had nothing to fall back on. We were losing all the duels, in the air, on the ground, 2nd balls etc. We had no way (other than Martinelli) to re-impose ourselves on the game or to find a semblance of control.
This is why I think adding players like Caicedo and Rice is vital this summer, because they can help us compete in a different way. Dealing with pressure in the first place is easier if you don't start losing all the aerial battles and second balls. Even if someone gives it away, if Caicedo or Rice help mop up, crisis is averted.