Thank you for all the helpful advice. I'm glad I asked because I was planning to pack a raincoat and it takes up a lot of room in my luggage.

I was thinking of wearing Teva (rubber) sandals in the rain because they are made for walking in rivers. Is that a bad idea because of what I am likely to be stepping in? I don't own a pair of rain boots (I'm a Californian) but I assume that I can buy them easily in India if necessary.