A quick guess before I zip out, Siasl...Tea, as opposed to water, contains various diuretic substances which
speed the process and make you want to pee sooner.
Whether juices and coffee contain these diuretic substances too I don't know and sadly (sadly? no way!) I haven't got time to google out the truth because I have a very important date with my very own 'diuretic of choice' namely a pint of Harvey's ale at the Brewer's Arms.
So successful is the diuretic effects of beer that when I drink a pint I always seem to pee a quart.
The same also applies to drinking shorts, wine, port, Grand Marnier, ...anything alcohol based in fact.
Somewhere I remember reading that the alcohol excites your Pituitary Gland, a small acorn sized gland round the
back of your head and one of its jobs is to control your pee output.
It doesn't matter how much liquid booze you drink, it is not the water content but the total alcohol content that causes the Pituitary Gland to go into lavatorial overdrive mode.
When it gets excited it can only react by making you pee more. Much more. And once the flood gates have opened, the alcohol level is still high so you just can't help but join the Greyhound Derby heading for the karzy.
Maybe tea also has this property? Maybe someone else can answer more. Right, I'm off. Cheers!