I've used a packable woodgas stove (similar to this) to heat water in a titanium pan (which I can fuel with twigs).
You can make a nice boiled tea from a fairly small amount of compressed puer. So it's quite efficient for camping. I also use Dian-Hong for boiling a sort of hot sweet milk-tea (you can add butter, dried milk or evaporated milk etc).
I use a simple pan and strain it into a large Stanley Thermos. You can also put just boiled water in the thermos and add semi-spent leaves in the morning. By the afternoon it'll turn into a nice round tea soup.
Very warming when at camp.
This is the same thing I have, works like a dream!
I got an amazon knock off before I knew it was a knock off. The thing's really fun and the weight is easily offset by how amusing it is.