Carry a combination plug that will feed into a round-pin socket: across the subcontinent plug point sockets are round rather than flat. Winters in the north are cold but days in the plains are sometimes sunny. Carry a combination of heavy woolens and light jumpers. It’s coldest from mid-December to mid-January. Get yourself an umbrella or raincoat. It’s always raining some region or another. In the summer be armed with sun protection: sunglasses, cap/hat, cream with a minimum SPF of 20.
Bring prescription medicines and an extra pair of spectacles/contact lenses (though opticians abound in cities). A sleeping bag and a bed sheet are a must for budget travellers.
All visitors are required to carry a passport valid at least for the next 6 months. Visa exemptions include:
1. Bhutanese and Nepalese visitors who are staying for less than 3 months.
2. Nationals from the Maldives, if they are staying for a maximum of 90 days (this includes any periods they may have spent in India up to 6 months prior to the visit in question).
3. Transit passengers who have a follow-on ticket within 72 hours of arrival as long as they are not going to leave the airport.
Special restrictions apply to Pakistani and Afghan nationals. Its always wise to check updated visa requirements prior to travel.