Have had similar problems on holiday in warm places… have purchased large plasters for wounds to hold a Libre 2 in place. My DN at home gave me some wonderful see Through sticky patches I used to use when swimming , but have not been able to track them down anywhere.
before you apply the new CGM wash and dry the new site thoroughly. Wipe with alcohol swab, allow to dry again, apply
sensor, and leave the applicator in position for a count of 10. Remove the applicator carefully, then seal round the edge of the sensor with a dry finger.
then apply a band aid, plaster, whatever to hold the thing on! I think patches are supposed to have a hole in the middle to align with the hole in the sensor. …so it doesn’t get water logged?
hoping you have a finger stick/glucose monitor with you, but it shouldn’t be a problem to buy one in a pharmacy..pictures off the internet will help explain if there is a language barrier.
hope you can enjoy the rest of your holiday.