All volunteers are advised to contact the Indian High Commission in their country and apply for visa before travelling to India. If you decide to stay longer in India, you can extend your visa after you arrive. Getting Indian Tourist Visa is very easy nowadays for travellers. You can get is 48 hours. You can apply for the on arrival tourist visa which is valid up to 60 days. This is very fast and quick process. This is the link to apply the tourist visa :- https://indianvisaonline.gov.in/evisa/tvoa.html