It's equal in volume of course, but the ice will be lighter.
About 1244 litres at STP, i.e. 1,244 m3. This is calculated by using the Avogadro's law and the ideal gas law, which gives that water vapor will have the molar volume of 22,414 litre/mol at STP. The...
250MLs
1 gallon of water = 231 cubic inches.
1 litre is a unit of volume, regardless of what it contains, or whether it's empty.