A canteen cup as used by the military is very useful to prepare a meal or boil water for coffee and tea.
A very efficient cooking setup is the Swedish army ”Trangia” system. This is a cooking pot nested in a special designed windscreen. Inside this windscreen is a folding pot stand. The heat source is a alcohol burner. The cooking pot has a cover lid that can also be used as a pan on its own.
The cooking pot stands inside the windscreen. By enclosing the bottom from the pot by the windscreen the heat from the flames is transferred more efficiently into the pot. Also the flames stay inside the windshield instead of going everywhere. It also makes sure that rain and wind have almost no effect on the burner. This windscreen stays around the pot when carried. It acts as a storage container. Big advantage is that the black soot that will be formed on the pot cannot easily be transferred to other equipment and your hands. Alcohol burns relatively clean compared to petrol based liquids. The smell is less and the formation of black soot is also lesser. Alcohol is widely available and you can bring it in a small bottle for a day hike or a big bottle for a multiple days. With gas burners you need to bring a whole canister. If running out of Alcohol you can also burn some wood twigs in this stove.