@pacathy For sinus rinsing I used a small electric pot to boil water. There are several collapsible ramen type pots on Amazon. I suggest trying the method at home before your trip. Plus, you'll need to make sure you have the correct power adapter. In some cases with the Amazon ramen pots they come with different power cords for various countries.

I took a domestic trip recently and washed the nebs etc in a collapsible silicone container and then used microwave bags to sanitize them. Even though we did not move around, it was a PITA ! Microwaves might be difficult to come by in Europe. Maybe disposable nebulizers are a more convenient answer.