Does how much one perspires correlate to how much water they drink?

No, perspiration is just individual to a particular person. I hardly ever sweat, so I know I'm hot if it starts running down my face. But my grandson sleeps over sometimes and he's only 6 and he dampens the sheets minutes after he falls off to sleep. I always take his covers off for a few minutes to let him cool down! He takes after his grandpa. So drink that water!