Help Charcoal method

[Nephis]

I want to do the charcoal and tent combo but how do I do it so it will work properly and what should I include to add on to the lethality?

 

[Pastdue]

I don't know I'm actually leaning more towards a small plastic garden greenhouse for charcoal. If I put and tape a ground sheet into one and tape the flip up door down then it should be really airtight. I tried looking at tents but they say you need one that isn't breathable and I just didn't know where to start there.