In the ship's kitchen, obviously. On the mundane coal stove where many a sailor's meals were cooked. And certainly not by asking a passing mage to do it for him because that would probably be seen as rude.

In any case, he returned shortly with a kettle of hot water.

"You are a stranger to this place, then?" He asked as he fished out his cannister of matcha. He didn't bother adding an 'as well' in there. He was fairly certain they both stood out as Rifters.