Not difficult to clean at all, we have the non stick version. It must be 10 years old at least, no signs of anything wearing out/coming off etc., etc..
Meths is best bought from chandleries or decorating shops, we tend to pay about £12-15 for 5ltr depending on where we buy it. We decant it into a couple of these
www.cotswoldoutdoor.com/trangia-fuel-bottle-1l-97220007?channel_code=110&id_colour=180&product_code=73492019&utm_source=google&_$ja=tsid:45886&gclid=CLGF2OjWq8cCFXQatAodYJgHxQ&gclsrc=aw.ds
We have just been away for two weeks and used about 5ltrs but that includes using a heat pal like this
www.tauntonleisure.com/tentipi-heat-pal-5100-spirit-heater-and-cooker/p1840#tdesc_9
It is basically a massive trangia that heats our tent, we cook on it when using a pressure cooker or making something in one pot like risotto and leave it on all night if it is cold to warm us up a bit. The heat pal takes a ltr at a time.
I reckon 2-3 ltrs would easily be enough for two weeks of dinner, drinks and breakfasts.
Because we use so much with the heat pal we take the 5ltr bottle and fill up the trangia bottles.
I love it, I made two curries, rice and warmed naan last week at the same time, just with a trangia and heat pal by putting the pans that had finished cooking on a wooden chopping board while I cooked the rice and naan.
We do have campingaz stove(s) as well, one of them is 25 years old, just have used them less and less over the last few years as we have come to prefer the meths burners..
Even better is that the trangia, in its billy can, fits inside my pressure cooker, so I have one pan with lots of options.
We do have two (or three or four) tiny meths burners that we seem to have acquired over the years, keep one in the car for tea on the road, the others are usually with us ...... just in case.