Hi Amelia,

Thank you for reading - I'm so glad you enjoyed it.

That's a great question! I had a quick look at the ITER website and it does look as though water for cooling will be substantial:

https://www.iter.org/mach/CoolingWater

But then, 'traditional' fission type power stations recycle the water (although a lot is needed):

https://www.energy.gov/ne/articles/nuclear-101-how-does-nuclear-reactor-work

I can only imagine a fusion power plant would have a similar water recycling system - which will hopefully mitigate the initial demand...