The stainless cup, you can ask the hotel for the hot water?

 

https://sunshinetoday168.pixnet.net/blog/post/62178613-%E3%80%8C%E5%8F%AF%E5%8F%A3%E5%B0%8F%E7%93%9C%E5%91%86%E8%84%86%E7%AC%9B%E9%85%A5%E3%80%8D-----%E9%85%A5%E8%84%86%E7%88%BD%E5%8F%A3%E9%9A%A8%E6%89%8B%E5%8C%85%E9%BB%9E

https://www.walkerland.com.tw/subject/view/221376