The dabbawalas are a monthly service and getting one-time delivery is generally not possible. Also, the dabbawalas don’t cook the food themselves they just deliver home cook food made by you to your loved ones.
As a tourist, I doubt whether you would be cooking and delivering your own food in tiffin boxes.
But if you would like to know more or just see how they function, I noticed that on their website there is something called a day with dabbawala.Maybe you can avail this service http://mumbaidabbawala.in/a-day-with-dabbawala/
Enjoy your stay in India.
Credit:stackoverflow.com‘