Trekking clothes 
Night clothes
Rain Gear
Gloves
Hat / Cap
Walking Boots
Socks
Rucksack / Daysack
Water Carrier
Tents / Flysheet
Sleeping Bag
Sleeping Mat
Food
Stove / Solid Fuel
Messtin / Pot
Cooking utensil (spoon, fork, etc.)
Compass
Torchlight 
Gas Lantern / Candle
First Aid
Sewing Kit

One Set
One Set
One set
One pair
One
One pair
Two pairs
One
Depends on trip
One for groups of 2/3/4
One
One
Depends
Depends
Depends on group
Depends on group
One
One
Depends on group
One for a group
One

Spare Trekking clothes
Gaiters
GPS
Topo Map
Trekking poles
Climbing Gear

One
One Pair
One
One (If you can get one)
One pair
Depends on trek