I do not know whether there is an Indian food market in Montevideo, but I know that all the basic food stuff are sold in the city.
And not just the basics, also some of the spices and special items you are used to at home.
You might need to look for the translation of the names of things, but almost all will be for sale, in markets or in small shops or even in supermarkets where the locals do their shopping. And you may need to learn to adjust or make some of the items, like using oil instead of ghee or making your own ghee from butter.
In this question people answered that Indian people
bring rice from home, but if you are willing to use different rice, you can buy locally.
If you decide to bring food from home, be aware that importing food and seeds is often not allowed into countries. And when you may import, it has to be free from diseases (and often you need a certificate to prove that.)