Cup, pint, quart, gallon, oz, bottle
I have no idea how to relate this to any meaningful metrics.
Past week I've been working on building a shed at one of our country places. We've had around 25 Celsius and no clouds, and I've been on the roof with tar paper. I've probably been downing about 4 litres a day, without peeing all day. I think that's a gallon and then some. And no, I haven't really paid attention to the shade of yellow, once I had to go in the evening.
Normally I'll probably drink about a 3/4 litre of water, and about a litre of coffee. I don't see the problem with that. If I'm thirsty I'll drink. If caffeine was diuretic enough to cause a problem I'd be shrivelled up like a raisin by now.