1 mol of gas at RT and 2bar occupies more or less 22L/2, so the vapour would indeed need that pressure to fit in the container.
Water at +40°C, less than +100°C, has an equilibrium vapour pressure under 1atm. Hence, condensation.
There is a minimum diameter that lets droplets grow faster than they evaporate. It depends on the temperature, pressure and surface tension. The initial droplets diameter might well be this minimum diameter. Should be available on Wiki or on the Web.