well, you have answered your own question there. the minimum amount of water needed to make 1L of steam is 1 litre. however to do this you are going to have boil the container dry, so i would use 1.25L of water, leaving a margin for letting some escape and also to avoid boiling the container dry.
It depends on the volume of the cup. 1L of water weighs 1kg.
6 1/2 cups
no extra water the 1L of water can be filtered through sand and activated carbon to remove some pollution, or it can be purified by evaporation and recondensation, or by chemical methods such as precipitation, without using any extra water
Since 1mL of water is equal to 1g, then 1000mL (or 1L) is equal to 1000g (or 1kg). Thus: 1L = 1kg.
A 1L pitcher of water will weigh exactly 1kg.
From a 1L bottle you should get 2 points.
About 14 calories or 60 Jules
$1.88
1l
1L is 1000ml or 1000cm3
1L = 100cL
It is 250/1000. You can simplify this fraction if required.