As others have mentioned, the water will eventually cool down until it's in thermal equilibrium with its environment, i.e., it has the same temperature as the room.
Cooler water (above 4°C) is more dense than warmer water, and so the volume of the cooled water is less than the original water volume. Liquid water is almost incompressible, so you can't reduce its volume (by any significant amount) by applying pressure, and neither can you increase its volume by reducing the pressure on it. That is, you can't stretch water. However, if you subject liquid water to a vacuum some of the liquid will change state and become water vapour until the vapour pressure is in equilibrium with the liquid, with the vapour pressure being dependent on the temperature in a non-linear way (the intermolecular forces of water are rather strong, so it does not behave like an ideal gas).
For example, let's say our container has a volume of 1 $m^3$ = 1000 $L$, and we fill it with water at 90°C. (Assume that any air that was dissolved in the water has been driven off by the heating process). Let the ambient temperature of the room be 20°C. According to Wolfram Alpha, the densities of water at those temperatures are:
20°C : 965.3 $kg/m^3$
90°C : 998.2 $kg/m^3$
Wikipedia says that water vapour at 20°C has a pressure of 2.3388 kPa or 0.0231 atmospheres. In other words, water boils at 20°C if the ambient pressure is 2.3388 kPa.
We have 998.2 $kg$ of water in our 1 $m^3$ rigid sealed container. When the water temperature drops to 20°C, its volume reduces to $965.3 / 998.2 = 0.9670 m^3$ leaving $1 - 0.9670 = 0.033 m^3 = 33 L$ for the water vapour. Those numbers aren't quite correct because some of the liquid is turned into vapour, but the volume of liquid lost is tiny compared to the total volume of liquid.
This site gives a figure of 17.3 $g/m^3$ for the density of water vapour at 20°C. So the mass of water in our vapour "pocket" is around 0.033 * 17.3 = 0.57 $g$, and the amount of liquid lost is around 57 $mL$, which is insignificant compare to 967 $L$.
The fact that water can't be stretched has important ramifications, as discussed in the Wikipedia article on cavitation.