Your best bet is to take a collapsible bucket and Milton tablets - use it for cold water sterilising but also to wash up the bottles too
Completely agree with Josie! I also found it was handy to pre-measure what 5litres of water looks like in the bucket and put a Sharpie line on there so you don't need to measure you can just fill it up to the line! X
@Josie its a nanobebe bottle
Our hotel provided a sterilizer and bottle warmer when we asked.. this was a Tui hotel
Buy a self sterilising bottle All you need is a microwave and water
What bottles do you have?