I am not an Android expert but I believe you will need to purchase security software. Your ISP provider might have something that you can install for free.
Privacy is a separate issue. You should be very cautious about the apps you install and what they are asking for access to (microphone, location, photos, etc.). Never install anything from outside of the Google app store.
Also considering doing a factory reset on the device when you return to rid the device of any software malware that may have found it's way on the device during your travels.