Field WiFi deployment - over 1km

Not sure if this is the appropriate sub, but this seems to comply with the rules...

TL;DR: solution that enables an Android tablet to be in the same network as a Windows Laptop over a 1km radius.

We have a customer that works with multiple DJI Matrice drones to map terrain on a pre-programmed path. There is some app on an Android tablet that connects to a service on a workstation laptop to retrieve and send data and REQUIRES to be on the same local subnet (we have tried via Public IP - no go). The client needs to connect from this tablet about 500m-1km away to the endpoint hosting the service (laptop) to control/monitor the drones.

There seem to be 3 options:

1. Find an AP that has 1km omi-direcitonal range - does such a thing exist?
2. Find a point to point WiFi solution - the issue second side has to be portable and be able to connect to the Android tablet
3. Deploy a portable mesh wifi network - dropping mesh APs in the field (quite literally)

The first solution would be ideal, but I doubt the low powered Android tablet WiFi will be able to connect to such an antenna... I don't really have a good understanding of RF though...

Welcome to any suggestions.