Hi. I have read of some who use a collapsible silicone hot pot (they also make a tee kettle) for cruises and hotels to sterilize. They simply collapse it and pack it away when out of the room so as not to alert housekeeping, if it's in a place where such electronics are frowned upon.
Drizzle Foldable Electric Hot Pot Cooker Travel Pot - Dual Voltage 100V-240V Cooking - Food Grade Silicone Cookerware Boiling Water Steamer - Camping Office Hotel Noodle Porridge Soup https://a.co/d/8pnPxFZ