Tholiak, Green Tea = NOT(Pee) [Boolean Logic, mmm?] It depends on what kind of green tea you may be drinking.
Now I admit that reeeaaallyy cheap [hands up, those who hate Lipton tea!] teas are, on the whole, horrible to drink and have little desirable effects on the body besides causing one to run to the tiolet to pee 500 litres of urine every half an hour.
But I am talking about good tea here.
Anyhow, from my experience, if you want to enjoy good strong geen tea [Madura Green Tea With Paw Paw Leaf, obtainable from supermarkets such as Woolworths], you brew it in a good travel mug with preferably no milk, at 71 degree Celsius to start with. Then when you're ready to drink it, turn the temperature down to say, 64 degree Celsius. You could sugar it, I suppose... I haven't tried that myself.
I reccomend you look up this website Jaycar for this "Travel Mug With In-Built Heater" product. The link is as follows;
Travel Mug With in-built heater
http://www1.jaycar.com.au/productResults.asp?FORM=CAT
And for a suitable powersupply [for those who have 240V AC power outlets] is as follows;
Suitable power-supply for the above travel-mug [12vdc 2amp]
http://www1.jaycar.com.au/productResults.asp?FORM=CAT
I hope the above links work...
Anyway, be aware that the mug takes 12v 1.5 amps [as measured on my workbench] when heating, idles at 100ma, and requires a male banana plug with positive tip. Be careful to get the wiring right - you want to enjoy a strong pot tea, don't you?
It works just great for brewing marijuana tea, with goat-milk [recommended, works better than cow's milk - different distribution of fats in it, I conjecture], tho' after around two hours brewing time, the milk tends to go cheesy. Without milk, brewing of marijuana tea can run all night and becomes wonderfully strong by time you wake up [late]. Just make sure that you keep the mug really clean, in general.
I don't know if the attachments I've just done, work here, but they should show the pics of the travel mug and the recommended power-supply. I do recommend the mug - very reliable... wore out mine first one in just six months, and am now using the second one right now.