For visitors to Ananthagiri hills, it is essential to have a valid passport and visa for entry into India. It is also recommended to be up to date with routine vaccinations such as measles, mumps, and rubella (MMR), diphtheria-tetanus-pertussis vaccine, varicella (chickenpox) vaccine, and yearly flu shot. Visiting the official government travel website for India is the best way to keep informed about any travel advisories or entry restrictions for foreign visitors.