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1 bottle per 200k: How big is the bottle? He's showing two on his bike for starters. Also if he's eating icecream and yoghurt he's getting some liquids there. Basically, it could mean anything - maybe that's an average but I'd put money on him drinking more in the afternoon and less at night so it's basically a meaningless comment without more information.
No, you can't 'train' to operate dehydrated. You can simply be dehydrated or not be dehydrated and your performance may suffer depending on how dehydrated you get.
This was for TCR 2014 on his blog
https://allegaertk.wordpress.com/2014/07/29/bike-set-up-transcontinentalrace-2014/