I'm pretty new two the teaworld and on this forum, so I hope you could give some good advice.
My situation:
For now, I am just a little experiment with all kinds of green teas. I'm testing which I do like, varies brewing methods and so on, the normal stuff I suggest.
My problem that is banging in my head is, how I could improve the way to get hot water.
Currently I am using an electric kettle, with witch I have to boil a min of 0,5L but I only need about 150ml. So its a lot of waste water and energy, because I have to reboil the water every time I want a new infusion ( to be exact, I let it cool down to about 75°C after the boiling, for my greens

I tried to store some water in a thermos bottle, but it tasted really flat and makes my tea kinda boring after a short amount of time, so this wasn't a good way to go for me.
So do you see where my problem is and do somebody have a solution or a little glimpse for a way to go?
I hope you understand what I mean, if not please feel free to ask
