I’d go and look at the science behind hydration, and see why the latest recommendations are to drink to thirst rather than a prescriptive drink x mls in x minutes.
Is the research about survival or atheltic performance?
The point that the research makes is that being a bit dehydrated doesn’t harm performance, whereas overhydrating by drinking before you feel thirsty appears to have a big negative effect on performance.
Something along those lines anyway. I suspect it is slightly more complicated, given they’ve written a whole book about it, but the general advice is that your body knows what it is doing, being thirsty is it’s way of telling you that you should drink something, and if it isn’t telling you, you probably don’t need to drink.
