>>167703then also check this one
http://www.safetravel.is/prop/but gas is most common both for screw on and camp gas cartridges, you can buy those at every gas station. I found it very convenient to cook in my tent vestibule, the wind is always pretty strong and cold in the highlands and rain is frequent.
except for one or two major highland destinations there are no shops, you have to bring every piece of gear and food yourself. If something breaks you either can fix it, got a backup solution, can make it without or you are plain fucked.
As I understand you plan to do this solo, so bring good gear. Good rain gear is a must and a bomb proof tent.
Travel months for the highlands are July and August, but I had snow on 3 different days.