Travel light and carry comfortable clothing and shoes. T-shirts and trousers can be bought anywhere in India at reasonable price. Women may try the Indian "salwar-kameez" which is very comfortable to wear. Keep a jacket and an umbrella handy.
The local Indian currency is Rupee. You can exchange your money at the airport when you arrive. There are many ATMs from where you can withdraw money from your country. Also, money transfer agencies are available which exchange foreign currency.
Both vegetarian and non-vegetarian dishes are widely available. Rice is the staple food and roti is a flatbread commonly available throught India. Drink packaged drinking water and insist for a sealed bottle.