What ingredients and/or equipment do people require for recreating authentic Indian food at home?

Literally nothing that unusual. You could almost make a great meal at home if you have basic ingredients like: cumin, garlic, ginger, brown sugar, cilantro, mint, vinegar, cayenne, cinnamon, lentils and rice. But ideally you can buy and have in your cabinet a few other spices like turmeric and coriander, daals (various types) and basmati rice. No special equipment is necessary, just a good, simple cookbook to follow and you are there.