I hope the below list is helpful when it's finally time for you to start packing...get excited!!

PRE-DEPARTURE

Read the Travel Advisory for your destination
Register on smarttraveller.gov.au (not sure what the equivalent in other countries is but in Australia, this website provides travel advice, registration of travel, and general travel information)
Passport (make sure it's valid for at least 6-12 months!)
Visa (in australia please refer to http://www.vfs-in-au.net)
Health Documentation and vaccinations
Transportation Tickets
Emergency Information
Insurance
Currency (I exchanged about $100 Australia and had money left over)
Guide Books and Maps (just for reference)
Trip Cancellation/Medical Insurance
Personal Identification
Photocopies of Documentation
AMOR Trip payment and information

BASIC

Luggage/Travel Pack
Travel Clothing - PACK LIGHT, I packed 3 paris of cotton loose pants (long) and 2 cotton shirts (long sleeve, NO low cuts). I took a laundry soap and washed and dried when I needed it.
Rain Protection - it's going to be monsoon season when we get there, I'm not sure how practical gum boots would be as not only will they be heavy but may be difficult to walk in
Travel Footwear - I wore one pair of light sandals but you may want to bring an extra pair of walking shoes
Thongs (what we call flip flops in Australia) to wear in the shower
underwear and socks
bikini to wear in shower (I didn't need this anywhere we went but just in case)
light jacket or sarong
Visor or Brimmed Hat
Water Bottle - important!
Travel Journal
Scarf/Bandanna - to cover your head or mouth, there's lots of dust and pollution levels are high in India
Travel Locks
Luggage ID Tags
fanny pack/bumbag and safe travel pouch/money belt
small day bag or backpack
bible (if you would like to read bible on the trip)
quick dry towel

MAINTENANCE ITEMS

Aspirin/Pain Reliever
electrolytes
peppermint oil (I didn't have to use this but it's helpful if you are sensitive to smells, but we didn't experience any extreme smells on our trip)
hand sanitizer
antibiotics
Cold Medicine
Diarrhea Medicine
Contact Lens Preparation
Laxative
Insect Repellent/bed bug spray (I also got insect repellent patches you can stick on your bed at night, available at chemists which helped alot)
Sunscreen
Sunburn Relief
Antibiotic Cream
Malaria Pills
Motion Sickness Medicine (ginger tablets are great)
Personal Hygiene Items
Personal Prescription
Water Purification System (you can get small, light sachets)
Vitamins (if you need them)