Hey! I think what you need is pretty much the same as Uber Eats. If I'm right and you don't want tracking, then you probably need 4 apps:
1 - for the user (see menu and available foods, order food, set location, etc).
2 - for the restaurant (update the menu, receive orders, etc).
admin panel (see the income, orders, etc).
This app needs online updating which will be implemented using Google's Firebase which is fast and secure. Also as a future update I can add a feature that let's the users choose their location on google Maps using Google Map API for faster deliveries and better service.
Also, I guarantee 6 months of full support with the application in case anything goes wrong and more support even after that, anytime you need it.
I've had some E-commerce projects like this one before and have some good experience with them. I'd be glad to help you with this project. If your interested please don't hesitate to contact me.
Sincerely