Order hot water (or tea) from room service sterilize in your sink.
There are also breast pump cleaning wipes and sprays you can purchase for travel.
Or u can go to infirmary when it open and see if they have microwave available (usually do) . You should bring whatever you sterilize in with you.
I got a bottle and pump sterilizer at
Walmart to use for travel only takes hot boiling water and 15 minutes of time to sit. It was like $10 and looks like a plate with a plastic cover almost like room service.