If you were told that the sun would disappear in a month, and you had 7 days to prepare, what would you need to survive for 7 days?

Dang. Kind to think of it, it would be pretty DARK.
No plants would grow as they need sunlight. 
It's gonna be pretty hard to live. But here are:

5 ESSENTIAL SURVIVAL TIPS TO DO IN CASE THE SUN DISAPPEARS FOR A LONG TIME WITH NO SIGNS OF COMING BACK.

1. Find an essential place to stay for an extended period of time. 
2. Bring enough food and water to stop getting hungry.
3. Tune in the TV every few periods of time to check on the world status. Chances are, that everything is dying slowly.
4. That's actually it. I don't know well enough to know how you will survive. For 7 days it would be OK. 

It was ernest rutherford