Take a water bottle that can withstand boiling water. I had a water system that didnt so I had to buy bottled water. Take your Nalgene bottles (dont leave behind like I did!).
I was advised by a reputable retailer that my -5 comfort level sleeping bag would be sufficient for a tea-house trek. It was NOT, I had to beg blankets every night. make sure you have a warmer bag with you.
Smart wool socks can last up to 6 days - dont take too many.
Bamboo clothing is amazing too - the tops also last many many days, so do the knickers but I'll keep those details to myself. This is really helpful when you have a 10kg weight limit.
I took loads of chocolate etc but you can buy this everywhere, i wouldnt take it all again if I went back.
Take your book, there is quite a lot of down time, I sacrificed my kindle for weight and wish I hadnt.
I took Yaktrax Extreme, which are slightly more expensive, but we had so much snow and ice on the trail but mixed with rocks. the traditional Yaktrax (coils) couldnt take the rocks and broke. The Extreme handled it all really well.