Oh my, you can turn used coffee grounds into logs for heating.
https://farrerscoffee.co.uk/how-to-make-your-own-coffee-logs/
I know privacy-conscious people who'd wipe their devices before and after entering China, but now it seems the surveillance is even more aggressive.
If you enter Xinjiang across a land border they put spyware on your phone.
https://www.theguardian.com/world/2019/jul/02/chinese-border-guards-surveillance-app-tourists-phones