I'd like to read about the ancient populations that combined to make up the modern day Indian population i.e. Ancestral North Indians(ANI)/Aryans and Ancestral South Indians(ASI)/Dravidians (although afaik all of those terms are misnomers to a certain extent). I also think we know of some East Asian admixture in modern-day East and North-East India so I'm interested in that too.

I'm interested in their culture, politics, religion (Dravidian religion in particular since there's so little information about it online), food and the ways in which the populations interacted. I'd also like to learn about the relationships between these populations and non-Indian ones. For example, the Aryan religion is said to have similarities with other Central Asian and European religions so that's an interesting topic to me.

This is a pretty politically charged subject so even though I've found some promising books online, I'm a little wary of political agendas of any kind. I'm also open to research papers but of course I prefer books for readability. If you take the time to actually write out answer on any of the topics, I'll be incredibly grateful.