Love the name.
If the main usecase is for ~10min of chai sipping time, then easy/hard is the onboarding? ie., agreeing to terms & conditions, login, payment etc. Will this require them to download a new app or will it just appear as WiFi network with a loginportal?
It would seem if the time frame was longer (say a train journey or cab stuck in traffic) the process might be worth it.
Did u guys explore movie theaters, local trains, cabs, city to city buses etc where time spent might be more, so users might be willing to buy more.