how to go to Jiuzhaigou from chengdu and is accommodation & food easily available in JZG?

From CD Xinnanmen Bus Station, there is one bus to reach JZG one day at around 08:00 in the morning, so you can take it. The bus fare is around 150RMB.
Or you can fly to reach JZG directly. The plane ticket fare is hard to tell, because a discount can be got if you book in advance.
It is suggested to stay there for about three days to visit both JZG and Huanglong together.
For accomodation, what is your budget? There are some luxury hotel and some hostles near the entrance. I lived in MIGU International Youth Hostel and I though it was perfect.
The local food is not very expensive, but the food may not be tasty.