Colour print film is readily available in India as are developing and printing facilities in most cities.
If you're taking slides, it's advisable to bring the film with you as colour slide film is available only in big cities. Whichever you decide, be prepared for plenty of beautiful sights.
Photography itself presents some special problems in India. In the dry season the hazy atmosphere makes it difficult to get sharp shots or to get much contrast between what you are photographing and the background.
Everything looks washed out and flat even with a polarising filter. In the mountains you should allow for the extreme clarity of the air and light intensity, and take care not to overexpose your shots.
In general, photography is best done in the early morning and late afternoon. Be careful what you photograph. India is touchy about places of military importance - this can include railway stations, bridges, airports and any military installations. If in doubt, ask. In general most people are happy to be photographed, but care should be taken in pointing cameras at Muslim women. Again, if in doubt, ask.
For those interested in getting a good view of a town or city, mosques and temples are perfect. The Jama Masjid in Delhi is one example, but in smaller places it is the simplicity and warmth of Indian hospitality that you want to capture.