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@ewanmac
If they are drinking that much then I would say that a key concern would be to maintain electrolytes.
There are twin conditions Hyper and Hyponatremia which relate to too high or too low concentrations of sodium in the blood. Hypernatremia can be caused through high levels of sweating, and Hyponatremia can be caused by excessive intake of water, and I believe is commonly associated with people trying to rehydrate with water too quickly after a period of dehydration.
If I recall correctly there have been several instances of people getting very sick (sometimes fatally) from Hyponatremia after hot running races if they fail to rehydrate sensibly. I've had the latter at least once (after a half marathon in extreme heat) and it isn't pleasant but given that I didn't die I probably had a pretty mild case.
Stay safe everyone.