Standard procedure for various large security-related companies when traveling abroad is to provide the employee with a temporary device with only files that are required for the trip. The device can be cleaned/analyzed/destroyed on return.

Although this is more or less the only way, it might not be practical. I'm not security expect and do not have the resources to do the above, but I take various precautions when traveling:

* Make use of a Cellular Data Plan.

* Make use of VPN (Roll your own, or have a look at the VPN Comparison Chart https://news.ycombinator.com/item?id=11294064)

* Do not keep devices unattended. Especially not in a hotel room.

* Use 2FA and other standard security practices (firewall, identify phishing, have most recent updates installed).